Repair and replacement

Changes to AC system components

Changes to AC system components

1976 models New evaporator cas ing cover C o v e r is s e a l e d wi th s e a l i n g c o m p o u n d .

T h e s e a l b e t w e e n the evapora to r p ipe, c o v e r a n d hea:e< h o u s i n g is m a d e wi th buty l t a p e .

Note: Do not insu la te e x p a n s i o n v a l v e .

S113260

8123159

1978 models Accumulator moved T h e a c c u m u l a t o r for the A C s y s t e m i s l o c a t e d

f ront p l a t e by t h e s i d e of t h e r ad i a to r . T h e s =

a c c u m u l a t o r i s u s e d in both the 2 4 0 a n d 2 6 0 s e r i e ;

240 expansion valve and thermostat in 260 T h e 2 6 0 s e r i e s d id not h a v e the e x p a n s i o n c

p r e s s u r e v a l v e s . T h e s e , w h i c h w e r e in tegra l /. -?

a c c u m u l a t o r , w e r e r e p l a c e d wi th the 2 4 0 ' s e x p a - ;

v a l v e ( A ) .

T h e 2 6 0 s e r i e s h a s the s a m e t h e r m o s t a t ( B ) a s the M i s e r i e s . T h i s m e a n s that the c o m p r e s s o r i s not wortiiis al l the t ime the A C s y s t e m is o n , but on ly when t e m p e r a t u r e of the e v a p o r a t o r s u r f a c e r i s e s a r : . T = g i v e n l e v e l .

S123160

2 ^

Repair and replacement

Changes to AC system components

1

0

S127063

1979 models Variable thermostat for cooled air The thermostat is controlled by turning a knob. This replaces the older toggle switch.

From the thermostat, a capillary tube runs to the evaporator

output pipe, the "hook"

The thermostat works in the same way as the old one. The difference is that it acts partly as an on/off switch, and partly that the temperature range it operates within can be reduced using the wheel.

Note: The orange (red) area of the thermostat control range must only be used when cooling and, in exceptional circumstances, in a dry desert climate. If you drive for too long with the setting lower than MAX, condensation water in the evaporator will freeze and prevent air flowing through.

240 Rubber-mounted compressor (cars without power

steering)

S127062

Larger-capacity compressor ! 240 petrol models only.

The compressor is designated the York A-210. It has a cylinder capacity of 164cm^ (0.173 US qt) (formerly 147cm^ (0.155 US qt)).

SI27934

243

Repair and replacement Changes to AC system components

S114887

Larger condenser T h e l a rge r c o n d e n s e r m e a n s the v o l u m e of coo lan t s

i n c r e a s e d to:

2 4 0 - 1.3 kg ( 2 . 8 6 lb)

2 6 0 - 1.5 kg ( 3 . 3 lb) '

New type of AC compensation In pr inc ip le, the w a y the s y s t e m w o r k s is that a n addi t lona' a m o u n t of fue l /a i r m ix tu re ( e v a p o r a t o r e n g i n e s ) or ar

( i n jec t ion e n g i n e s ) is a l l o w e d th rough the thrott le w h e n the c o m p r e s s o r c u t s in . i

T h e s y s t e m c o n s i s t s of a s o l e n o i d v a l v e , a v a c u u r r

v a l v e a n d v a c u u m h o s e s . F o r m o r e d e t a i l s of A C

c o m p e n s a t i o n , s e e p a g e s 2 3 2 - 2 4 1 .

1980 models Compressor for 260 T h e moun t ing l ugs h a v e me t r i c i n s t e a d of the earue*-imper ia l t h r e a d s . T h e mount ings c o n c e r n e d a r e a r r o w e r in the I l lus t ra t ion .

Diesel A n A C s y s t e m is a v a i l a b l e a s e x t r a e q u i p m e n t for d i e s ^

m o d e l s { D 2 4 ) . T h e c o m p r e s s o r in the kit is m a a e

S a n k y o a n d h a s me t r i c t h r e a d s .

Note: T h e diesel engine does not h a v e A C c o m p e n s a r : " (Idling compensa t i on ) .

8128795

Repair and replacement

Changes to AC system components

SI35796

Delay relay for cutting in compressor This means that the compressor does not cut in until

approx. 10 seconds from when the engine starts and

the generator supply reaches the relay.

1981 models Low-pressure cut-out on drier (USA only, other markets from 1985 onwards)

This sensor detects the pressure inside the drier. If the system pressure is too low, the circuit breaks and the compressor will not start. This prevents the compressor being damaged if the pressure in the system is too low.

Constant idling system (CIS) Introduced in certain models and markets (mainly USA).

These models have no AC compensation system.

8700757S

1985 models Diesel Kiki compressor in B-200/B-230 engines The compressor has six cylinders and three double-

action pistons.

An oblique drive plate transmits the rotary movement of

the compressor shaft to the positions via drive bearings

and bearing set.

The compressor housing is aluminum and is made in two halves. The pistons are aluminum and have no piston rings.

The clutch is electromagnetic.

Repair and replacement

Changes to AC system components

SI39044

A C system si lencer ( M o d e l s wi th D i e s e l K i k i c o m p r e s s o r on l y )

T o r e d u c e the n o i s e leve l w h e n the A C s y s t e m c u t s in, a

s i l e n c e r w a s inc luded on the h i gh -p ressu re s i de b e t w e e n

the c o m p r e s s o r a n d c o n d e n s e r .

T h e coo lan t c o m e s in p u l s e s a t h igh p r e s s u r e f rom the c o n d e n s e r .

T h e s i l e n c e r ' s leng th a n d d i a m e t e r a r e d e s i g n e d to

a l l ow the c o o l a n t to e x p a n d , t h u s s l o w i n g the p u l s e s .

T h i s r e d u c e s the n o i s e l e v e l .

T h e s i l e n c e r a n d h o s e s to a n d f rom it a r e no l onger a v a i l a b l e a s s p a r e s . If t he re is a faul t in t he s i l e n c e r or the h o s e s c o n n e c t e d to it, r e p l a c e it w i th a n u n b r o k e n h o s e f rom the c o m p r e s s o r to the c o n d e n s e r .