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How to wire coil connector?

BG1 on Tue May 21, 2013 11:07 AM User is offline

Year: 1990
Make: chevy
Model: truck
Engine Size: 350
Refrigerant Type: R134a
Country of Origin: United States

I need to change out the original 2 lead spade connector on my 90 Chevy to a 8 mm pin 2 lead connector. The connector on the new compressor has a -minus and +plus on it but the old compressor does not have any markings. My wiring connector has a green wire and a black wire, the black is on the right side and the green is on the left, the new compressor connector has the negative on the left and the positive on the right. So I do not know if my wiring has the black wire being negative and understand that if there is a diode it matters which way its wired up.

GM Tech on Tue May 21, 2013 11:09 AM User is offline

Wire green to positive (+), black to ground (-)

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......

BG1 on Tue May 21, 2013 3:09 PM User is offline

BG1 on Tue May 21, 2013 3:20 PM User is offline

Sorry I messed up with my last message

Update I have the ac in my 90 Chevy truck working with the r134a but want to know if its doing all it can do. The outside temp is 88 degrees and the humidity is 63 percent the center vent temp is at 55 degrees with the windows open and the other vents closed at idle.The low pressure gauge is at 38 and the high is at 265 and I put in about 36oz. I used a digital scale to weight this.

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