10 - 2
Air Conditioning (cont’d)
No Air Conditioning
CHECK
ACTION
1
Are the controls set correctly, i.e. air conditioning
YES:
Check 2
selected, thermostat switch set to coldest position
NO:
Reset controls and retest.
and blower switched on?
2
Is the air conditioning (evaporator) blower working?
YES:
Check 3.
NO:
Check 4.
3
Is the compressor running (visual check of pulley/clutch)?
YES:
Check 9.
NO:
Check 5.
4
Is the air conditioning fuse(s) blown?
YES:
Renew fuse(s) and retest.
NO:
Check 8.
5
Is there a 12V supply to the pressure switch harness?
YES:
Check 6.
Refer to
Service Procedures - Pressure Switch Testing
NO:
Check 7.
6
Does the compressor clutch engage with
YES:
Replace pressure switch assembly.
pressure switch assembly bypassed?
NO:
Renew the compressor clutch and retest.
Refer to
Service Procedures - Pressure Switch Testing
7
Does the clutch engage with thermostat switch
YES:
Renew thermostat switch and retest.
bypassed?
NO:
Check all electrical connections.
8
Are blower switch and wiring OK?
YES:
Renew blower unit complete.
NO:
Renew switch or wiring.
9
Is sight glass indication OK?
YES:
Check 10.
NO:
Charge check required by refrigeration engineer or
suitably trained person.
10
Is condensor air flow blocked?
YES:
Clean condensor and radiator.
NO:
Check 11.
11
Is evaporator air flow blocked?
YES:
Clean filter and, if necessary the evaporator.
NO:
Call in refrigeration engineer or suitably trained
person.
Section B
9803/3280
Section B
10 - 2
Issue 1
Fault Finding
