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Relay anyone?

kwandobe on Sat August 27, 2011 6:55 PM User is offline

Year: 1991
Make: Pontiac
Model: Trans Sport
Engine Size: 3.1L
Refrigerant Type: 134a
Country of Origin: United States

So I retrofitted my system, with new access ports for 134a anyway. The air has never worked since I bought it, and even after putting pressure in the system it wouldn't kick on. I get voltage to my clutch coil but no amperage. I have jumped my high side and my coolant fans come on and just today I jumped my clutch coil with 10amps, clutch kicked in and compressor began to spin.

So my question is, is it a relay? I can't be the electronic climate control cant it? Seeing as how I get voltage when I turn on my ac via my controls I would think not. And now I know my clutch coil isn't bad. All of my fuses are fine. I'd like to think I know what to replace before I have my system vacuumed and before I fill it. It wont be much fun running a new switch for the clutch to my dash, but that's a thought!

Any idea's?

Thanks =)

GM Tech on Sat August 27, 2011 7:21 PM User is offline

did you try disconnecting the battery for 10 seconds-- this vans are known for hidden codes set...

-------------------------
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......

kwandobe on Sat August 27, 2011 8:21 PM User is offline

Yea I've tried that, no codes. =(

mk378 on Sat August 27, 2011 9:10 PM User is offline

If its a 2-wire clutch, the ground side could be open. There is power to it but no current flow because there is no ground.

Don't run the compressor for more than a couple of seconds without a proper retrofit.

Edited: Sat August 27, 2011 at 9:11 PM by mk378

kwandobe on Mon August 29, 2011 4:34 AM User is offline

Yup it's a two wire clutch. It has voltage flowing through the wires, just doesn't seem to have adequate amperage, that's why I'm thinking it could be the relay. I know if my high blower relay goes I get voltage but no amps, that's what I'm basing my thoughts on. so really I may know the answer already, just wanted everyone elses thoughts is all.

Thanks =)

mk378 on Mon August 29, 2011 8:14 AM User is offline

With everything plugged in, how many volts do you have between the coil terminals? If it's more than 11 or so you may just be seeing normal drops in the wiring. Marginal clutch engagement means the air gap is too wide.

GM Tech on Mon August 29, 2011 8:16 AM User is offline

So what is keeping you from swapping the relay with a known good one mounted next to it?

-------------------------
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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