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elect problem pontiac montana

jack31ca on Tue June 08, 2010 9:39 PM User is offline

Year: 2000
Make: pontiac
Model: montana
Engine Size: 3.4
Refrigerant Type: 134-a
Ambient Temp: --------
Country of Origin: Canada

im here again when is wired direct it cools but cant get it to work from the switch on the dash did computer reset (disconnect ground wire) as you suggested ,checked for broken wires ,bad connections, what else could it be ? thank you

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jack31ca

GM Tech on Wed June 09, 2010 8:45 AM User is offline

Measure voltage at high side pressure transduccer- you should have +5v, Ground, and reference voltage based on system pressure (0 to 5v). I have seen two cars have this problem in last month. Had to re-pin the connector.

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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