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AC troubleshooting

bmx_02 on Mon June 29, 2009 8:34 PM User is offline

Year: 2002
Make: Chevy
Model: Silverado
Engine Size: 4.8
Refrigerant Type: 134a
Pressure Low: 60 psi
Country of Origin: Canada

Ill try be detailed but brief, I turn my AC on but i get nothin this is what ive troubleshooted but im stumped.
Its an 02 silverado LS with just your standard HVAC and AC button, non of that duel zone or auto climate stuff or rear auxillary controls.

Jumped the compressor at relay - Compressor engadged and the ac pipes got cold, so compressor is not the issue
Checked the refigerent charge - OK

so the problem is the circuit that triggers the relay, for the compressor.

Tested the relay and check all fuses - All OK!
Jumped low pressure switch - still got no compressor engadging
tested the ground and voltage to the low pres switch harness - had ground continuity and voltage, so its OK
tested the ground and voltage to high pres switch harness - had ground continuity and voltage to so its OK
AC light on HVAC control lights up when pushed and all nessessary settings are correct - OK
When turning AC system on, the truck slightly increases ide - Therefore the PCM is receiving signal from the HVAC control that AC is on.

Anymore hints or suggestions on what it could be or anymore tests that i should try?

Chick on Mon June 29, 2009 9:57 PM User is offlineView users profile

when you jumped the relay what were both pressures and the ambient temp taken at...

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

mk378 on Mon June 29, 2009 10:51 PM User is offline

Test that you have voltage to the coil pin of the relay. The PCM should drive the other coil pin to ground. Try swapping with another same type relay in the box.

bmx_02 on Tue June 30, 2009 1:39 AM User is offline

the 2 pins that switch the compressor (ground and 12V) were fine, i jumped them and the compressor engadged however i found on the coil pins i only had ground continuity but no voltage. should there be a constant voltage to the coil pin and the relay is triggered by engadging a ground or is it the voltage to the coil pin that is used to switch the relay?

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