Land Rover Defender 90 110 Workshop Book 5 Rover

AIR CONDITIONING-L.H. R.H. STEERING 182 
2k . - NOTE: A  special  wrench  should be used to adjust  the d.:,  ~ . valve 
to prevent  damage to  the stem. 
The  stem  type  service  valve has  three  positions,  the 
operation 
of which is explained  as follows. 
A. 
ON: FULLY  ANTICLOCKWISE - Normal 
operating  position, and  the position  which is used 
for  connecting  and  disconnecting the manifold 
gauge  set, is 
the on position.  The stem  is turned 
fully  anticlockwise.  This seals  the  service...

AIR CONDITIONING - L.H. & R.H.  STEERING 
Schrader Type 
These  are secured  to the  head  of the  compressor,  and 
the suction  and  discharge  flexible end  connections  are 
secured 
to them  by unions. 
The  service  valves are identified  as  suction 
or low 
pressure,  and discharge 
or high  pressure.  Whilst they 
are  identical 
in operation  they are not  interchangeable, 
as  the  connections  are of different  sizes. 
The  valve  with the  larger  connections  fits the suction 
side. 
As the...

AIR CONDITIONING- L.H. & R.H. STEERING 
ELECTRICAL CIRCUIT DIAGRAM 
Key to Circuit Diagram 
1. 
2 
3. 
4. 
5. 
6. 
7. 
8. 
9 
10. 
11. 
12. 
13. 
14. 
15. 
16. 
17. 
18. 
19. 
20. 
21. 
Thermostat  Condenser  fan relay 
5 amp  fuse 
17 amp fuse 
Compressor  clutch relay 
L.H.  fan 
R.H.  fan 
High  pressure  switch 
Compressor  clutch temperature  switch 
Compressor  clutch 
Fan  temperature  switch 
Blower  fan relay 
Diode 
-Diesel  engines  only 
Termination  point* 
Ignition  feed pick
-off point...

82 I AIR CONDITIONING - L.H. & R.H. STEERING 
VOLTAGE AT 
BOTH 
ENDS  OF FUSE 
CHECK 
FOR STALLED  MOTOR 
f f 
+ t 
MOTOR OK MOTOR STALLED * 
CHECK MOTOR 
GROUND 
CHECK  FOR SHORT  REPLACE MOTOR 
CIRCUIT  AND CORRECT 
ELECTRICAL 
AIR  CONDITIONER  BLOWER MOTOR AND CONTROL  SYSTEM DIAGNOSIS 
VOLTAGE  AT 
BATTERY 
SIDE  ONLY 
* 
REPLACE  FUSE 
BLOWER 
MOTOR OPERATES 
1 INSPECT  RESISTOR  BLOCK 1 
RESISTOR  BLOCK  RESISTOR BLOCK OK 
INSPECT BLOWER 
RESISTOR  BLOCK 
I 
REPLACE SWITCH 
IF  DEFECTIVE 
I...

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...