Troubleshooting - Porsche 928 - WORKSHOP MANUAL 1977 Workshop Manual

87
Air Conditioner
928
AIR CONDITIONER, TROUBLESHOOTING
Complete
cooling
failure
l.Rupture element in fluid tank
ruptured.
The system has overheated. Check
operation and direction of
rotation of cooling blower.
2.Connect service device and check
pressure values.
Low pressure too low.
High pressure too low.
No refrigerant in the system.
Look for leak. Refill air
conditioner.
3.Switch on air conditioner and
check pressure values.
Low pressure too high.
High pressure too low.
Compressor defective.
Low pressure too low.
High pressure too high.
Expansion valve defective.
Insufficient
Cooling output
Connect service device.
Witch on air conditioner and check
pressure readings.
l.Low pressure normal.
High pressure too high.
The system is overfilled. Discharge
air conditioner and refill.
2.Low pressure too low.
High pressure too low.
Insufficient coolant in system.
Look for leak. Refill air
conditioner.
3.Low pressure too high.
High pressure normal.
Expansion valve defective.
Insufficient
Cooling
output
After Brief Period
of Operation
Initial cooling output is satisfac-
tory, but diminishes after a period
of time.
Ice accretion on evaporator. Anti-
freeze protection switches off air-
conditioning compressor. Check
correct seating of capillary tube
and inspect for damage.
or
a
87 - 118 Troubleshooting Printed in Germany