ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET
HINT:
This is a method where a manifold gauge set is used to help locate the problem.
(a) Read the manifold gauge pressure when the following conditions are met:
Test conditions:
(1) Normally functioning refrigeration system Gauge Reading
|
|
(2) Moisture is present in the refrigeration system.
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
During operation, pressure on low pressure side cycles between normal and vacuum |
|
|
|
(3) Insufficient cooling
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Gas leaks from the refrigeration system |
|
|
(4) Poor circulation of refrigerant
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Refrigerant flow is obstructed by dirt inside the pipes of the condenser core |
Receiver is clogged |
Replace condenser |
(5) Refrigerant does not circulate.
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
|
Refrigerant does not circulate |
|
(6) Refrigerant is overcharged or cooling effectiveness of condenser is insufficient.
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
|
|
|
(7) Air is present in the refrigeration system.
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Air in system |
|
|
(8) Expansion valve malfunction
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Expansion valve may be stuck |
|
Check expansion valve |
(9) Insufficient compressor compression
Symptom |
Probable Cause |
Diagnosis |
Corrective Action |
---|---|---|---|
|
Internal leak in compressor |
|
Replace compressor |
Gauge readings (Reference)
Check For Intermittent Problems
CHECK FOR INTERMITTENT PROBLEMS
HINT:
Inspect the ECM using check mode. Intermittent problems are easier to detect
with the Techstream when the ECM is in check mode. In check mode, the ECM uses 1
trip detection logic, which is more sensitive to malfuncti ...
Canceling the power back door system (vehicles with power back door)
Turn the main switch to disable the power back door system.
1. Inoperative
2. Operative
The back door cannot be operated even with the wireless remote control or power
back door switch.
A buzzer will sound twice if the power back door switch is pressed ...
Air Conditioning Amplifier
Components
COMPONENTS
ILLUSTRATION
Installation
INSTALLATION
PROCEDURE
1. INSTALL AIR CONDITIONING AMPLIFIER ASSEMBLY
(a) Install the air conditioning amplifier assembly with the 2 screws.
...