1970-74 Challenger/Cudawith Factory AirEvaporator Kit

574074-EDZ

an ISO 9001:2015 Registered Company

18865 Goll St. San Antonio, TX 78266 Phone: 800-862-6658

Sales: sales@vintageair.comTech Support: tech@vintageair.com

www.vintageair.com

907074-EDZ REV F 8/21/18, PG 1 OF 24

2907074-EDZ REV F 8/21/18, PG 2 OF 24

1. Cover 2. Table of Contents 3. Packing List/Parts Disclaimer 4. Information Page 5. Wiring Notice 6. Engine Compartment Figure 1 7. Condenser, Compressor Bracket, & Passenger Compartment Figures 2 & 3 8. Passenger Compartment (Cont.) Figures 4 & 5 9. Fresh Air Cap & A/C Duct Hose Adapter Installation Figures 6, 7, & 810. Evaporator Installation Figure 911. Evaporator Installation (Cont.) Figures 10, 10a, & 10b12. Firewall Cover Installation Figure 1113. Drain Hose Installation Figures 12 & 12a14. A/C & Heater Hose Installation15. A/C Hose Routing Figures 13 & 13a16. Heater Control Valve Installation Figure 1417. Control Panel Wiring & Duct Hose Routing Figure 1518. Evaporator Hardline & Bracket Installation Figure 1619. Wiring Diagram20. Gen IV Wiring Connection Instructions21. Operation Of Controls22. Troubleshooting Information23. Troubleshooting Information (Cont.)24. Evaporator Kit Packing List

Table of Contents

3907074-EDZ REV F 8/21/18, PG 3 OF 24

** Before beginning installation, open all packages and check contents of shipment. Please report any shortages directly to Vintage Air within 15 days. After 15 days, Vintage Air will not be responsible for missing or damaged items.

Packing ListEvaporator Kit (574074-EDZ)

No. Qty. Part No. Description

1.2.

11

744004-VUE784074-PMF

Gen IV 4-Vent Evap. Sub Case 1970-74 Challenger/Cuda with A/C Accessory Kit

1

Accessory Kit784074-PMF

2

Note: Images may not depict actual parts and quantities. Refer to packing list for actual parts and quantities.

OFF

DASH

HOT

FLR

HI

DEF

COLD

AC

Gen IV 4-VentEvap. Sub Case

744004-VUE

4907074-EDZ REV F 8/21/18, PG 4 OF 24

Important Notice—Please ReadFor Maximum System Performance, Vintage Air Recommends the Following:

New Vintage Air-supplied Sanden Compressor: No additional oil needed (Compressor is shipped with proper oil charge).All Other Compressors: Consult manufacturer (Some compressors are shipped dry and will need oil added).

NOTE: Vintage Air systems are designed to operate with R134a refrigerant only. Use of any other refrigerant could damage your A/C system and/or vehicle, and possibly cause a fire, in addition to potentially voiding the warranties of the A/C system and its components.

Refrigerant Capacities:Vintage Air System: 1.8 lbs. (1 lb., 12 oz.) of R134a, charged by weight with a quality charging station or scale. NOTE: Use of the proper type and amount of refrigerant is critical to system operation and performance.Other Systems: Consult manufacturer’s guidelines.

Lubricant Capacities:

Safety Switches

Service Info:Protect Your Investment: Prior to assembly, it is critical that the compressor, evaporator, A/C hoses and fittings, hardlines, condenser and receiver/drier remained capped. Removing caps prior to assembly will allow moisture, insects and debris into the components, possibly leading to reduced performance and/or premature failure of your A/C system. This is especially important with the receiver/drier. Additionally, when caps are removed for assembly, BE CAREFUL! Some components are shipped under pressure with dry nitrogen.Evacuate the System for 35-45 Minutes: Ensure that system components (Drier, compressor, evaporator and condenser) are at a temperature of at least 85° F. On a cool day, the components can be heated with a heat gun or by running the engine with the heater on before evacuating. Leak check and charge to specifications.

Your Vintage Air system is equipped with a binary pressure safety switch. A binary switch disengages the compressor clutch in cases of extreme low pressure conditions (Refrigerant Loss) or excessively high head pressure (406 PSI) to prevent compressor damage or hose rupture. A trinary switch combines Hi/Lo pressure protection with an electric fan operation signal at 254 PSI, and should be substituted for use with electric fans. Compressor safety switches are extremely important since an A/C system relies on refrigerant to circulate lubricant.

Bolts Passing Through Cowl and/or Firewall:To ensure a watertight seal between the passenger compartment and the vehicle exterior, for all bolts passing through the cowl and/or firewall, Vintage Air recommends coating the threads with silicone prior to installation.

Heater Hose (Not Included With This Kit):Heater hose may be purchased from Vintage Air (Part# 31800-VUD) or your local parts retailer. Routing and required length will vary based on installer preference.

5907074-EDZ REV F 8/21/18, PG 5 OF 24

Important Wiring Notice—Please Read

Some Vehicles May Have Had Some or All of Their Radio Interference Capacitors Removed. There Should Be a Capacitor Found At Each of the Following Locations:

1. On the positive terminal of the ignition coil.2. If there is a generator, on the armature terminal of the generator.3. If there is a generator, on the battery terminal of the voltage regulator.

Most alternators have a capacitor installed internally to eliminate what is called “whining” as the engine is revved. If whining is heard in the radio, or just to be extra cautious, a radio interference capacitor can be added to the battery terminal of the alternator.

It is also important that the battery lead is in good shape and that the ground leads are not compromised. There should be a heavy ground from the battery to the engine block, and additional grounds to the body and chassis.

If these precautions are not observed, it is possible for voltage spikes to be present on the battery leads. These spikes come from ignition systems, charging systems, and from switching some of the vehicle’s other systems on and off. Modern computer-operated equipment can be sensitive to voltage spikes on the power leads, which can cause unexpected resets, strange behavior, and/or permanent damage.

Vintage Air strives to harden our products against these types of electrical noise, but there is a point where a vehicle’s electrical system can be degraded so much that nothing can help.

Radio interference capacitors should be available at most auto and truck parts suppliers. They typically are cylindrical in shape, a little over an inch long, a little over a half inch in diameter, and they have a single lead coming from one end of the cylinder with a terminal on the end of the wire, as well as a mounting clip which is screwed into a good ground on the vehicle. The specific value of the capacitance is not too significant in comparison to ignition capacitors that are matched with the coil to reduce pitting of the points.

Care must be taken, when installing the compressor lead, not to short it to ground. The compressor lead must not be connected to a condenser fan or to any other auxiliary device. Shorting to ground or connecting to a condenser fan or any other auxiliary device may damage wiring, the compressor relay, and/or cause a malfunction.

When installing ground leads on Gen IV systems, the blower control ground and ECU ground must be connected directly to the negative battery post.

For proper system operation, the heater control valve must be connected to the ECU.

•

•

•

6907074-EDZ REV F 8/21/18, PG 6 OF 24

OEM A/C Line

OEM A/C Line

Blower Assembly

OEM Compressor

& Compressor Bracket

Figure 1

OEM Condenser

OEM Drier

Hood LatchAssembly

Engine Compartment

Disconnect battery.Drain radiator.Evacuate the A/C system if necessary.Remove hood latch assembly.Remove OEM condenser and drier.Remove OEM A/C lines from compressor to evaporator.Remove OEM A/C compressor and compressor bracket.Remove OEM blower assembly.Remove OEM evaporator.

1.2.3.4.5.6.7.8.9.

NOTE: Before starting the air conditioner installation, check all components (radio, lights, wipers, etc.) for proper operation, and study the instructions, illustrations and diagrams.

7907074-EDZ REV F 8/21/18, PG 7 OF 24

Figure 2

Figure 3

Condenser Assembly & Installation

Compressor & Brackets

Passenger Compartment

Refer to separate instructions included with the condenser kit to install the condenser. Refer to Figure 2, below, for condenser location.

Refer to separate instructions included with the bracket kit to install the compressor bracket.

To ease installation, loosen the top (4) dash mounting bolts located in defrost ducts along the bottom side of the windshield, and the (2) side dash mounting bolts.Pull dash away from windshield to remove (4) OEM defrost duct mounting screws (See Figure 3, below).Remove passenger side OEM A/C duct assembly (See Figure 3, below).Remove driver side OEM A/C duct assembly (See Figure 3, below).Remove OEM defrost duct assembly (See Figure 3, below).

1.

1.

1.

2.

3.4.5.

OEMRadiator

Out In

CoreSupport

07321-VUCDrier

(4) OEMMounting ScrewsOEM Defrost

Duct Assembly

DriverOEM A/C

Duct Assembly

PassengerOEM A/C

Duct Assembly

101008-ECD#8 Condenser Hardline

101006-ECL#6 Drier/Core

Hardline

35368-VCG#6 Condenser/Drier

Hardline

8907074-EDZ REV F 8/21/18, PG 8 OF 24

Figure 5

Figure 4

Passenger Compartment (Cont.)Remove the OEM heater/evaporator assembly from under dash as shown in Figure 4, below.Remove the OEM control panel assembly from dash as shown in Figure 4, below.Refer to control panel conversion kit instructions for installation of controls.

Using the OEM mounting screw, install the new defrost ducts as shown in Figure 5, below.

1.2.3.

1.

Defrost Duct Installation

OEM ControlPanel Assembly

OEM Heater/EvaporatorAssembly

Defrost Duct

OEMScrew

OEMScrew

9907074-EDZ REV F 8/21/18, PG 9 OF 24

Figure 6

Figure 8

Figure 7

Fresh Air Cap InstallationUsing (2) #10 x 1/2" sheet metal screws, install the fresh air cap as shown in Figure 6, below.1.

Passenger and Driver SideA/C Duct Hose Adapter Installation

Install the A/C duct hose adapters as shown in Figure 7, below.Install the driver side louver hose adapter on control panel assembly as shown in Figure 8, below.

1.2.

(2) 18247-VUB#10 x 1/2"

Sheet Metal Screws

620073-PMEFresh Air Cap

492077-PMEPassenger Side Louver

Hose Adapter492074-PME

Center LouverHose Adapter

492078-PMEDriver Side Louver

Hose AdapterControl Panel

Assembly

10907074-EDZ REV F 8/21/18, PG 10 OF 24

Figure 9

Evaporator InstallationMark front evaporator mounting bracket hole locations on inner cowl (See Figure 10a, Page 11). Once holes are marked in the correct location, drill 1/8" holes in inner cowl for front evaporator bracket mounting location.Mark and drill (2) 9/32" holes for driver/passenger side evaporator rear mounting bracket in firewall (SeeFigure 10b, Page 11).On a workbench, install evaporator rear bracket and hardlines with properly lubricated O-rings (See Figure 13a, Page 15, and Figure 16, Page 18).Install front mounting bracket on evaporator using (2) 1/4-20 x 1/2" hex bolts, and tighten as shown in Figure 9, below.Lift evaporator unit up under the dashboard (See Figure 10, Page 11). Secure loosely to the firewall fromthe engine compartment side using (2) 1/4-20 nuts and washers (See Figure 10, Page 11).Using (2) #14 x 3/4" sheet metal screws, secure the front evaporator mounting bracket to the inner cowl(See Figure 10, Page 11).Verify that evaporator unit is level and square to the dash. Then tighten all mounting bolts. NOTE: Tighten the bolt on the firewall first. Then tighten the front mounting bracket screws.

1.

2.

3.

4.

5.

6.

7.

(2) 1/4-20 x 1/2"Hex Bolts

11907074-EDZ REV F 8/21/18, PG 11 OF 24

Figure 10

Figure 10aFigure 10b

Mark & Drill 9/32"Holes

4" 4" 2"

7"1 ⅞"

8 ⅜"8 ¼"

Passenger SideFirewall

(2) 1/4-20 Nutsw/ Washers

Firewall

InnerCowl

View Through Dash

(2) #14 x 3/4"Sheet Metal

Screws

Mark & Drill 1/8"Holes

12907074-EDZ REV F 8/21/18, PG 12 OF 24

Figure 11

Firewall Cover InstallationApply 1/4" bead of silicone around the back side of the firewall cover as shown in Figure 11, below.Pass lines through firewall cover, and secure with (2) 7/16" panel retainers (See Figure 11, below).Apply a 1/4" bead of silicone around the back side of the A/C block-off plate as shown in Figure 11, below.Drill (2) 1/8" holes in firewall using the A/C block-off plate as a template (See Figure 11, below).Install the A/C block-off plate using (2) #10 x 1/2" sheet metal screws as shown in Figure 11,below.

1.2.3.

4.5.

Back Sideof A/C Block-off

Plate

Back Sideof Firewall

Cover

(2) #10 x 1/2"Sheet Metal

Screws

Drill (2) 1/8"Holes

(2) 189002-MSR7/16" PanelRetainers

Silicone

Silicone

13907074-EDZ REV F 8/21/18, PG 13 OF 24

Figure 12a

Figure 12

Drain Hose InstallationInstall grommets in OEM holes (See Figure 12, below).Install drain hose to the bottom of the evaporator unit and route through the firewall (See Figure12a, below).

1.2.

OEMDrainHole

33133-VUIGrommet

w/ 1/2" Hole

33132-VUIGrommet

DrainHose

Drain

14907074-EDZ REV F 8/21/18, PG 14 OF 24

A/C Hose Installation

Modified A/C Hose Kit

Heater Hose & Heater Control Valve Installation

Locate the #8 compressor A/C hose. Lubricate (2) #8 O-rings (See Figure 13a, Page 15) and connect the 135° fitting to the #8 discharge port on the compressor, then route the 45° fitting to the #8 condenser hardline on the fender well (See Figure 13, Page 15). Tighten each fitting connection as shown in Figure 13a, Page 15.Locate the #10 compressor A/C hose. Lubricate (2) #10 O-rings (See Figure 13a, Page 15) and connectthe 90° fitting to the #10 suction port on the compressor, then route the straight fitting to the #10 evaporator hardline coming through the firewall (See Figure 13, Page 15). Tighten each fitting connection as shown in Figure 13a, Page 15. NOTE: Wrap the #10 fitting connections at the firewall with press tape (See Figure 13, Page 15).Locate the #6 evaporator/core hardline. Lubricate (2) #6 O-rings (See Figure 13a, Page 15) and connectthe hardline to the #6 hardline on the fender well from drier. Attach the other end of the hardline with lubricated O-ring to the #6 evaporator hardline coming through the firewall (See Figure 13, Page 15). Tighten each fitting connection as shown in Figure 13a, Page 15. Use a #2 Adel clamp to secure the #6 evaporator/core hardline to the inner fender well as shown in Figure 13, Page 15. Secure the Adel clampto the inner fender using a #10 x 1/2" sheet metal screw.

1.

2.

3.

Refer to separate instructions included with modified hose kit.1.

Route a piece of heater hose from the water pump to the heater line coming through the firewall as shown in Figure 13, Page 15, and Figure 14, Page 16. Secure using hose clamps.Route a piece of heater hose from the intake to the heater line coming through the firewall as shown in Figure 13, Page 15, and Figure 14, Page 16. NOTE: Install heater control valve in line with intake manifold (pressure side) heater hose. Secure using hose clamps as shown in Figure 14, Page 16. Also note proper flow direction.

1.

2.

Locate the #10 compressor A/C hose. Lubricate (2) #10 O-rings (See Figure 10a, Page 14) and connect the 90° fitting to the #10 suction port on the compressor, and then route the straight fitting to the #10 evaporator hardline coming through the firewall (See Figure 10, Page 14). Tighten each fitting connection as shown in Figure 10a, Page 14. NOTE: The #10 A/C hose 90° fitting at the compressor must be installed below the #8 135° hose fitting. This needs to be done so the air filter box is not pushed out of position by the #10 A/C hose. In some cases the fuel filter may block the routing of the #10 hose, if so the fuel filter will have to be relocated to clear the routing of the #10 hose. Wrap the #10 fitting connections at the firewall with press tape (See Figure 10, Page 14).Locate the #8 compressor A/C hose. Lubricate (2) #8 O-rings (See Figure 10a, Page 14) and connect the 135° fitting to the #8 discharge port on the compressor, and then route the 45° fitting to the #8 condenser hardline on the fender well (See Figure 10, Page 14). Tighten each fitting connection as shown in Figure 10a, Page 14.Locate the #6 evaporator/core hardline. Lubricate (2) #6 O-rings (See Figure 10a, Page 14) and connect the hardline to the #6 drier/core hardline on the fender well from the drier. Attach the other end of the hardline with lubricated O-ring to the #6 evaporator hardline coming through the firewall (See Figure 10, Page 14). Tighten each fitting connection as shown in Figure 10a, Page 14. Use a #2 Adel clamp to secure the #6 evaporator/core hardline to the inner fender well as shown in Figure 10, Page 14. Secure the Adel clamp to the inner fender using a #10 x 1/2” sheet metal screw.

1.

2.

3.

A/C Hose Installation

15907074-EDZ REV F 8/21/18, PG 15 OF 24

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16907074-EDZ REV F 8/21/18, PG 16 OF 24

To Water Pump

ECUModule

PressTape

ExpansionValve

FirewallCover

HeaterHose

O-ring#10 Suction

Hose

NOTE: Flow direction followsmolded arrow on valve.

#6 LiquidLine

Figure 14

#10 SuctionLine (Insulated)

Heater Control Valve Installation

Duct Hose Routing & Control Panel Harness

Install duct hoses as shown in Figure 15, Page 17.Plug the control panel harness into the ECU module on the sub case as shown. See Figure 15, Page 17.Route the control panel harness under the center dash assembly and connect the control harness to the PC board assembly on the back side of the control panel as shown in Figure 15, Page 17.Plug the wiring harness into the ECU module on the sub case as shown (Wire according to wiring diagram on Page 19).Reinstall control panel. Refer to control panel conversion kit instructions.Reinstall all previously removed items (battery box & battery).Fill radiator with at least a 50/50 mixture of approved antifreeze and distilled water. It is the owner's responsibility to keep the freeze protection at the proper level for the climate in which the vehicle is operated. Failure to follow antifreeze recommendations will cause heater core to corrode prematurely and possibly burst in A/C mode and/or freezing weather, voiding your warranty.Double check all fittings, brackets and belts for tightness.Vintage Air recommends that all A/C systems be serviced by a certified automotive air conditioning technician.Evacuate the system for a minimum of 45 minutes prior to charging. Perform a leak check prior to servicing.Charge the system to the capacities stated on the information page (Page 4) of this instruction manual.

1. 2. 3.

4.

5. 6. 7.

8. 9.10.11.

From Intake

From Htr Cntrl Vlv

17907074-EDZ REV F 8/21/18, PG 17 OF 24

Figure 15

Control Panel & Duct Hose Routing

Back SideOf PC BoardAssembly

Control PanelHarness

From ECU232007-VUR

Driver SideDefrost Duct

2" X 18"

Passenger SideLouver

2 ½" X 48"

Passenger SideDefrost Duct

2" X 16"

Driver SideLouver

2 ½" X 36"

PassengerSide

Louver

CenterLouver

PassengerSide

Center LouverDriver Side

Center LouverDriver Side2 ½" X 20"

Center LouverPassenger Side

2 ½" X 26"

PlugFromWiring

Harness232600-VUA

PlugFrom

ControlWiring

Harness232007-VUR

Driver SideLouver

18907074-EDZ REV F 8/21/18, PG 18 OF 24

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19907074-EDZ REV F 8/21/18, PG 19 OF 24

WHT/GRN

WHT/YELWHT/RED

RED

WHTBACKLIGHT NEG

FAN WIPER

MODE WIPER

TEMP WIPER

5V-SW

GND

BACKLIGHT POS

AC ANNUNCIATOR

PRE-WIRED

GEN IV WIRING DIAGRAMREV E, 10/6/2017

GEN IV ECU

PROGRAM

Wiring Diagram

TEMP

MODE

FAN

A/C(IF USED)

232007-VUR

232002-VUA

** CIRCUITBREAKER30 AMP

*** WIDE OPENTHROTTLESWITCH

(OPTIONAL)

* DASH LAMP(IF USED)

Dash Lamp Is Used Only With Type 232007-VUR Harness.Warning: Always Mount Circuit Breaker As Close to the Battery As Possible. (NOTE: Wire BetweenBattery and Circuit Breaker Is Unprotected and Should Be Carefully Routed to Avoid a ShortCircuit).Wide Open Throttle Switch Contacts Close Only at Full Throttle, Which Disables A/C Compressor.

JF8

BLK

ORA

TAN

VIEWED FROM WIRE SIDE

* **

***

HEATERCONTROL VALVE

20907074-EDZ REV F 8/21/18, PG 20 OF 24

RED

CIRCUIT BREAKER30 AMP

+

+

-

BLACK

REDWHITE

RED

CHASSIS GROUND

A/CCOMPRESSOR

RELAY

Ignition Switch:

Dash Light:

NOTE: MOUNT RELAYIN DESIRED LOCATION

UNDER DASH

GREEN

FIREWALL

BLUE

BLUE

RED &

WHITE

VIOLET

(IGNITION HOTTERMINAL)

IGNITION SWITCH

DASH BACK LIGHT+0-12vTAN

GRAY

BLUE

WHITE

WHITE

REDRED

WHITE

COMPRESSOR

BATTERY

NOTE: CONNECT WHITEWIRES DIRECTLY TO

(-) BATTERY TERMINAL

BATRUN

12V

RED GREEN

RED

RED

BLUE

LATCH

BLACK

BINARYSAFETYSWITCH

YELLOW

ORANGE

WIRING HARNESS

Violet 12V Ign Switch Source (Key On Accessory) Position Must Be Switched.

Tan Wire Used Only With Vintage Air Supplied Control Panel With LED Back Light.

Binary: Connect As Shown (Typical Compressor Wiring). Be Sure Compressor Body Is Grounded.

Trinary Switch: Connect According To Trinary Switch Wiring Diagram.

Install With Servo Motor Facing Down, As Shown. Note Flow Direction Arrow Molded Into Valve Body, And Install Accordingly.

White Must Run To (-) Battery. Red May Run To (+) Battery Or Starter. Mount Circuit Breaker As Close to Battery As Possible.

Heater Control Valve:

Binary/Trinary & Compressor:

Circuit Breaker/Battery:

CONTROL WIRING HARNESS

NOTE: YELLOW & ORANGE

COMING FROM HARNESS ARE NOT

USED.

WIRING HARNESS

GRAY WIRE IS USED FOR PROGRAMING CONTROLS

IF APPLICABLE

WIRING HARNESS

Gen IV Wiring Connection Instruction

HEATERCONTROL VALVE

WARNING: ALWAYS MOUNT CIRCUIT BREAKER

AS CLOSE TO THE BATTERY AS POSSIBLE. (NOTE: WIRE BETWEEN BATTERY AND CIRCUIT BREAKER IS UNPROTECTED

AND SHOULD BE CAREFULLY ROUTED TO AVOID A SHORT CIRCUIT).

NOTE: HEATER CONTROL VALVE CONNECTION AND CHASSIS GROUND MAY BE LOCATED ON EITHER SIDE OF THE FIREWALL. ENSURECONNECTOR IS LATCHED

FIRMLY.

21907074-EDZ REV F 8/21/18, PG 21 OF 24

Operation of Controls

Adjust to desiredspeed.

Blower SpeedAdjust to desired

speed.

Adjust to desiredmode position (DASH position recommended).

Adjust to desiredspeed.

Adjust to DEFROST position for maximum defrost, or between FLOOR and DEFROST positions for a bi-level

blend (Compressor is automatically engaged).

Adjust to desired temperature.

For A/C operation, adjust tocoldest position to engage

compressor (Adjust between HOT and COLD to reachdesired temperature).

A/C Operation

Heat Operation

Defrost/De-fog Operation

On Gen IV systems with three lever/knob controls, the temperature control toggles between heat and A/C operations. To activate A/C, move the temperature lever/knob all the way to cold and then back it off to the desired vent temperature. For heat operation, move the temperature lever/knob all the way to hot and then adjust to the desired vent temperature. The blower will momentarily change speed, each time you toggle between operations, to indicate the change. NOTE: For proper control panel function, refer to control panel instructions for calibration procedure.

Blower Speed

Blower Speed

This lever/knob controlsblower speed, from

OFF to HI.

This lever/knob controls the mode positions,from DASH to FLOORto DEFROST, with a blend in between.

This lever/knob controlsthe temperature,

from HOT to COLD.

Blower Speed

Mode Control

Temperature Control

Temperature Control

Temperature Control

Temperature Control

Mode Control

Mode Control

Mode Control

For maximum heating, adjust to hottest position (Adjust between HOT and COLD to reach desired temperature).Adjust to desired

mode position(FLOOR position recommended).

NOTE: A/C operation toggles on & off when thermostat lever is moved to the HOT or COLD ends of travel. A/C mode is indicated by the blue A/C light.

OFF HI

DASH DEF

HOT COLD

FLRA C

A/C LightTemperature

Control

ModeControl

Blower Speed

OFF HI

DASH DEF

HOT COLD

FLRA C

OFF HI

DASH DEF

HOT COLD

FLRA C

OFF HI

DASH DEF

HOT COLD

FLRA C

22907074-EDZ REV F 8/21/18, PG 22 OF 24

Sym

pto

m

Con

dit

ion

Ch

ecks

A

ctio

ns

Not

es

Blo

wer

sta

ys o

n hi

gh s

peed

whe

n ig

nitio

n is

on.

1a.

No

othe

r fu

nctio

ns w

ork.

Che

ck f

or d

amag

ed p

ins

or

wires

in c

ontr

ol h

ead

plug

.Ve

rify

tha

t al

l pin

s ar

e in

sert

ed in

to p

lug.

Ens

ure

that

no

pins

are

ben

t or

dam

aged

in E

CU

.Che

ck f

or d

amag

ed g

roun

d w

ire

(whi

te)

in c

ontr

ol h

ead

harn

ess.

Verify

con

tinui

ty t

o ch

assi

s gr

ound

with

whi

te c

ontr

ol

head

wire

at v

ario

us p

oint

s.

Loss

of gr

ound

on

this

wire

rend

ers

cont

rol h

ead

inop

erab

le.

All

othe

r fu

nctio

ns w

ork.

Che

ck f

or d

amag

ed b

low

er

switc

h or

pot

entio

met

er a

nd

asso

ciat

ed w

irin

g.

Blo

wer

sta

ys o

n hi

gh s

peed

whe

n ig

nitio

n is

on

or o

ff.

Unp

lug

3-w

ire

BSC c

ontr

ol

conn

ecto

r fr

om E

CU

. If

blo

wer

sh

uts

off,

ECU

is e

ither

im

prop

erly

wired

or

dam

aged

.

Be

sure

the

sm

all,

20 G

A w

hite

gro

und

wire

is c

onne

cted

to

the

bat

tery

gro

und

post

. If

it is

, re

plac

e th

e EC

U.

Unp

lug

3-w

ire

BSC c

ontr

ol

conn

ecto

r fr

om E

CU

. If

blo

wer

st

ays

runn

ing,

BSC is

eith

er

impr

oper

ly w

ired

or

dam

aged

.

Che

ck t

o en

sure

tha

t no

BSC w

irin

g is

dam

aged

or

shor

ted

to v

ehic

le g

roun

d. T

he B

SC o

pera

tes

the

blow

er

by g

roun

d si

de p

ulse

wid

th m

odul

atio

n sw

itchi

ng.

The

posi

tive

wire

to t

he b

low

er w

ill a

lway

s be

hot

. If

the

“g

roun

d” s

ide

of t

he b

low

er is

sho

rted

to

chas

sis

grou

nd,

the

blow

er w

ill r

un o

n H

I.

Repl

ace

BSC (

This

will

req

uire

rem

oval

of ev

apor

ator

fr

om v

ehic

le).

No

othe

r pa

rt r

epla

cem

ents

sh

ould

be

nece

ssar

y.

Com

pres

sor

will

no

t tu

rn o

n (A

ll ot

her

func

tions

w

ork)

.

2.

Syst

em is

not

cha

rged

.Sy

stem

mus

t be

cha

rged

for

co

mpr

esso

r to

eng

age.

Cha

rge

syst

em o

r by

pass

pre

ssur

e sw

itch.

Dan

ger

: N

ever

byp

ass

safe

ty s

wit

ch w

ith

en

gin

e ru

nn

ing

. S

erio

us

inju

ry c

an r

esu

lt.

Syst

em is

cha

rged

.

1b

.

Trou

ble

shoo

tin

g G

uid

e

Che

ck f

or f

aulty

A/C

po

tent

iom

eter

or

asso

ciat

ed

wirin

g (N

ot a

pplic

able

to

3-po

t co

ntro

ls).

Che

ck f

or d

isco

nnec

ted

or

faul

ty t

herm

isto

r.

Che

ck c

ontin

uity

to

grou

nd o

n w

hite

con

trol

hea

d w

ire.

Che

ck f

or 5

V o

n re

d co

ntro

l hea

d w

ire.

Che

ck 2

-pin

con

nect

or a

t EC

U h

ousi

ng.

To c

heck

for

pro

per

pot

func

tion,

che

ck v

olta

ge a

t w

hite

/blu

e w

ire.

Vol

tage

sh

ould

be

betw

een

0V a

nd

5V,

and

will

var

y w

ith p

ot

leve

r po

sitio

n.

Dis

conn

ecte

d or

fau

lty

ther

mis

tor

will

cau

se

com

pres

sor

to b

e di

sabl

ed.

Red

wire

at A

/C p

ot s

houl

d ha

ve a

ppro

xim

atel

y 5V

w

ith ig

nitio

n on

. W

hite

w

ire

will

hav

e co

ntin

uity

to

chas

sis

grou

nd.

Whi

te/

Blu

e w

ire

shou

ld v

ary

betw

een

0V a

nd 5

V w

hen

leve

r is

mov

ed u

p or

dow

n.

3. Com

pres

sor

will

no

t tu

rn o

ff

(All

othe

r fu

nctio

ns

wor

k).

Che

ck f

or f

aulty

A/C

po

tent

iom

eter

or

asso

ciat

ed

wirin

g.

Che

ck f

or f

aulty

A/C

rel

ay.

Repa

ir o

r re

plac

e po

t/co

ntro

l wirin

g.

Repl

ace

rela

y.

See

blo

wer

sw

itch

chec

k pr

oced

ure.

23907074-EDZ REV F 8/21/18, PG 23 OF 24

Sym

pto

m

Con

dit

ion

Ch

ecks

A

ctio

ns

Not

es

Syst

em w

ill n

ot

turn

on,

or

runs

in

term

itten

tly.

4.

Wor

ks w

hen

engi

ne is

not

runn

ing;

shu

ts o

ff w

hen

engi

ne is

sta

rted

(T

ypic

ally

ear

ly G

en I

V,

but

poss

ible

on

all

vers

ions

).

Noi

se in

terf

eren

ce f

rom

eith

er

igni

tion

or a

ltern

ator

.

Inst

all c

apac

itors

on

igni

tion

coil

and

alte

rnat

or.

Ensu

re

good

gro

und

at a

ll po

ints

. Re

loca

te c

oil a

nd a

ssoc

iate

d w

irin

g aw

ay f

rom

ECU

and

ECU

wirin

g. C

heck

for

bur

ned

or lo

ose

plug

wires

.

Verify

con

nect

ions

on

pow

er

lead

, ig

nitio

n le

ad,

and

both

whi

te g

roun

d w

ires

.

Verify

pro

per

met

er f

unct

ion

by c

heck

ing

the

cond

ition

of

a kn

own

good

bat

tery

.

Igni

tion

nois

e (r

adia

ted

orco

nduc

ted)

will

cau

se t

he

syst

em t

o sh

ut d

own

due

tohi

gh v

olta

ge s

pike

s. I

f th

isis

sus

pect

ed,

chec

k w

ith a

qu

ality

osc

illos

cope

. Spi

kes

grea

ter

than

16V

will

shu

t do

wn

the

ECU

. In

stal

l a

radi

o ca

paci

tor

at t

he

posi

tive

post

of

the

igni

tion

coil

(See

rad

io c

apac

itor

inst

alla

tion

bulle

tin).

A

faul

ty a

ltern

ator

or

wor

n ou

t ba

tter

y ca

n al

so r

esul

tin

thi

s co

nditi

on.

Will

not

tur

n on

und

er

any

cond

ition

s.Ve

rify

bat

tery

vol

tage

is

grea

ter

than

10

volts

and

less

than

16.

Loss

of

mod

e do

or

func

tion.

No

mod

e ch

ange

at

all.

Che

ck f

or d

amag

ed m

ode

switc

h or

pot

entio

met

er a

nd

asso

ciat

ed w

irin

g.

Part

ial f

unct

ion

of m

ode

door

s.

Typi

cally

cau

sed

by

evap

orat

or h

ousi

ng

inst

alle

d in

a b

ind

in t

he

vehi

cle.

Be

sure

all

mou

ntin

g lo

catio

ns li

ne u

p an

d do

n’t

have

to

be f

orce

d in

to p

ositi

on.

Blo

wer

tur

ns o

n an

d of

f ra

pidl

y.

6.

Bat

tery

vol

tage

is a

t le

ast

12V.

Che

ck f

or a

t le

ast

12V a

t ci

rcui

t br

eake

r.En

sure

all

syst

em g

roun

ds a

nd p

ower

con

nect

ions

are

cl

ean

and

tight

.

Bat

tery

vol

tage

is le

ss

than

12V

.

5.

Trou

ble

shoo

tin

g G

uid

e (C

ont.

)

Che

ck f

or f

aulty

bat

tery

or

alte

rnat

or.

Cha

rge

batt

ery.

Syst

em s

huts

off

blo

wer

at

10V.

Poo

r co

nnec

tions

or

wea

k ba

tter

y ca

n ca

use

shut

dow

n at

up

to 1

1V.

7. Whe

n ig

nitio

n is

tu

rned

on,

blo

wer

m

omen

tarily

co

mes

on,

the

n sh

uts

off.

This

oc

curs

with

the

bl

ower

sw

itch

in

the

OFF

pos

ition

.

This

is a

n in

dica

tor

that

the

sy

stem

has

bee

n re

set.

Be

sure

the

red

pow

er w

ire

is o

nth

e ba

tter

y po

st,

and

not

on a

sw

itche

d so

urce

. Als

o, if

the

sy

stem

is p

ulle

d be

low

7V f

orev

en a

spl

it se

cond

, th

e sy

stem

will

res

et.

Run

red

pow

er w

ire

dire

ctly

to

batt

ery.

Che

ck f

or p

ositi

ve p

ower

at

heat

er v

alve

gre

en w

ire

and

blow

er r

ed w

ire.

Che

ck f

or g

roun

d on

con

trol

hea

d w

hite

w

ire.

Che

ck f

or o

bstr

ucte

d or

bi

ndin

g m

ode

door

s.Che

ck f

or d

amag

ed s

tepp

er

mot

or o

r w

irin

g.

Erra

tic f

unct

ions

of

blow

er,

mod

e,

tem

p, e

tc.

Che

ck f

or d

amag

ed s

witc

h or

po

t an

d as

soci

ated

wirin

g.Re

pair o

r re

plac

e.

8.

Checked By:Packed By:

Date:

1.2.

11

744004-VUE784074-PMF

1

Accessory Kit784074-PMF

2

Gen IV 4-Vent Evap. Sub Case 1970-74 Challenger/Cuda with A/C Accessory Kit

NOTE: Images may not depict actual parts and quantities. Refer to packing list for actual parts and quantities.

OFF

DASH

HOT

FLR

HI

DEF

COLD

AC

Gen IV 4-VentEvap. Sub Case

744004-VUE

Packing ListEvaporator Kit (574074-EDZ)

No. Qty. Part No. Description

907074-EDZ REV F 8/21/18, PG 24 OF 24