SECTION 50 - CAB HEATING AND AIR CONDITIONING 37
PERFORMANCE TEST EXAMPLE 6
Performance Test Example 6
1. High side normal
2. High side hand valve closed
3. High side hose connected to high side service
connector
4. Not used
5. Low side hose connected to low side service
connector
6. Low side hand valve closed
7. Low side normal
PROBLEM
Little or no cooling.
CAUSE
Large amount of air in system.
CONDITIONS*
Low side pressure too high. Gauge should read 1-2
bar.
High side pressure too low. Gauge should read
13.3-14.8 bar.
Evaporator air not cold.
CORRECTIVE PROCEDURES
1. Discharge and recover the refrigerant from the
system.
2. Replace receiver/drier.
3. Evacuate the system.
4. Charge the system.
5. Performance test the system.
DIAGNOSIS
Air in the system. Air and humidity contained in it
contaminate the system: therefore, it will operate in-
correctly.
NOTE: * test procedure based upon ambient tem-
perature of 35 °C.
For proper high side gauge reading for other ambi-
ent temperatures, refer to the pressure temperature
chart.
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F28701
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