Land Rover Defender 90 110 Workshop 1984 Rover Manual

AIR CONDITIONING - L.H. & R.H. STEERING 1821 
Type of Evaporator 
Weather Air Temp F 
(C) 
. .* a-.~ I. >- 

1821 AIR CONDITIONING - L.H. & R.H. STEERING 
FAULT 
A. HIGHHEAD PRESSURE 
B. LOWHEAD PRESSURE 
C. 
HIGH SUCTION 
PRESSURE 
5. LOW  SUCTION 
E. NOISY EXPANSION VALVE (steady  hissing) 
F.  INSUFFICTENT 
COOLING 
G. COMPRESSOR  BELT 
H. ENGINE NOISE ANDiOR VIBRATION 
CAUSE 
1. Overcharge of refrigerant. 
2.  Air in system. 
3. 
4.  Condenser  fan motor  defective. 
Condenser 
air passage  clogged  with dirt 
or other 
foreign  matter. 
I. 
2. 
3. Defective  compressor 
Undercharge 
of refrigerant;...

AIR CONDITION NG - L.H. & R.H. STEERING (821 
COMPRESSOR AND CLUTCH DIAGNOSIS 
COMPRESSOR CLUTCH WILL 
NOT  ENGAGE 
1 NO VOLTAGE  AT CLUTCH I 
. 
OPEN  FUSE 
PUSH-BUITTON SWITCH 
DEFECTIVE 
I FAULTY  WIRING 
POOR CLUTCH  GROUND 
v 
CYCLING  CLUTCH SWITCH 
J 
I 
IF CONTACT  OPEN 
REPLACE  SWITCH 
I 
I t I 
VOLTAGE  AT CLUTCH  LOW 
+ 
I OPEN CLUTCH-COIL~ 
7 
REPLACE  COIL 
COMPRESSOR  WILL NOT TURN  PROPERLY 
CLUTCH  ENGAGES  BUT SLIPS  OR SMOKES 
I I I 
t 
CLUTCH-SLIPPING 
c 
I I LOW  VOLTAGE  AT CLUTCH...

1821 AIR CONDTTIONING - L.H. & R.H. STEERING 
MECHANICAL 
AIR  CONDITIONER 
BLOWER MOTOR  AND CONTROL  SYSTEM DIAGNOSIS 
t 
ENGTNE RUNNING  TO *I PROVIDE VACUUM 
I -1 MODE CONTROL LEVER  IN 
FLOOR DUMP  POSTTION 
LOWER 
MOTOR  OPERATIV 
i I 
f 
MODE CONTROL  LEVER 
IN DE-MIST POSITION  MODE CONTROL LEVER 
IN 
FASCIA  OUTLET  POSITION  AIR 
DISCHARGE  AT FASCIA 
I I I 1 
.c 
NO  AIR  FROM 
FASCIA  LOUVRES 
FAULTY  MODE DOOR 
VACUUM  SWITCH + FAULTY MODE DOOR NO DISCHARGE AIR FROM 
DE-MIST  OUTLETS 
c NO...

AIR CONDITIONING - L.H. & R.H. STEERING 1821 
e L. .z CHARGING  AND TESTING  EQUIPMENT 
Connecting  the gauge  set 
NOTE 
1: There  are two  methods  of connecting  the 
charging  and  testing  equipment,  depending on the 
operation  to be  carried  out.  The  method described  for 
‘evacuating 
or charging  with liquid  refrigerant’  also 
applies  to  ‘pressure test’ and ‘compressor  oil level 
check’  operations. 
.: :. 
NOTE 2: Various  types of charge and  test equipment 
are  available depending...

182 I AIR CONDITIONING - L.H. & R.H. STEERING 
WARNING: Open connections  slowly, keeping  the 
15. Turn the stem on the  discharge  valve clockwise 
until the pressure  rises on the  discharge 
pressure  gauge. If the  system  is 
to be 
evacuated,  the discharge  service valve seat 
16. The charging  and testing  equipment  is now 
connected  and ready  for proceeding  with the 
required  operation. 
16. Close the compressor  discharge service port 
(turn  anti
-clockwise). --. 
Removing 
17. If the...

AIR CONDITIONING - L.H. & R.H. STEERING 
- 2. Adjust both service  valve seats to the mid 
(Test)  position. 
*F>, I .; 4. NOTE: If it is necessary to disconnect  the compressor 
hoses,  the compressor  should  be sealed  by fully  closing 
the  relevant  service  valve  (turn  fully  clockwise). 
It is 
essential to ensure  that  both  service  valves  are open 
before  operating  the  compressor.  Similarly  any other 
component  of the  refrigeration system should  be capped 
immediately when...

- 
82 
7. The low  side  gauge  should  indicate  a vacuum  of 
660 
mm (26  in) Hg  within  five minutes. 
8. Whilst  the system is evacuating, fill the  charging 
cylinder  by opening  the refrigerant  drum 
valvc. 
9. Open the valve  at the  base  of the  charging  cylinder 
and 
fill the  cylinder  with 1,0 kg (2.2 Ib) of 
refrigerant.  Liquid refrigerant will be observed 
rising  in 
the sight glass. 
10. As the refrigcrant stops  filling  the cylinder,  opcn 
the  valve 
at the top of the cylinder...

AIR CONDITIONING - L.H. & R.H. STEERING IS21 
i( 13. Crack the suction valve charging  line at the service 
port  on  the  compressor  to allow  an escape 
of 
refrigerant,  at  the same  time observing thc sight 
glass 
in the  charging cylinder. A slight  drop in the 
level  should  be allwwed before  closing  the 
connection  at the  compressor. 
1. 
14. Close  the high pressure  valve (No. 2). 
15. Close valve No. 3. 
16. Close  the valve  at the  top  of the charging  cylinder. 
14-10 
ST 1397M 
17....

182 I AIR CONDITIONING - L.H. & R.H. STEERING 
Ambient 
Temperature 
C OF 
16  60 
26,7 80 
38  100 
433 110 
5. Insert the probe  between the magnetic  clutch and 
compressor  to check  the shaft  seal for leaks. 
6. Check all service  valve conncctions, valve plate, 
head  and base  plate  joints and  back seal plate. 
7.  Check  the  condenser  for  leaks at the  pipe 
connections. 
8. If  any  leaks  are found,  the system  must  be 
depressurised  before  attempting rectification. 
If 
repairs by...