94CutlassSLCoupe Posted May 23, 2005 Report Posted May 23, 2005 Ok..My A/C had a leak and hasn't worked since last fall...but at that time the compressor cylcled on fine when it was full of R-134 I put some R-134& stop leak in (with guage) and got it up to the right pressure, the compressor clutch did not kick in. Jumped low pressure cut-off switch...passenger side fan came on immediately, but no compresser clutch Tested A/C relay by using one from my dad's '94 cs vert, no difference checked HVAC fuse, good... I'm pretty baffled as I am getting NO voltage at the compressor clutch plug...although there is this little white box about 3" down the wire that I have no idea what it does. Other than that, the only thing i can think of is a broken wire somewhere!!! ARRGH! Help!!! Quote
cutlsp Posted May 23, 2005 Report Posted May 23, 2005 that is one thing i'm not willing to work on is ac your braver then me i'll give you that much. i can only think its a broken wire somewhere but i sure hope it isn't :? i would try grounding the power wire and see if you get a voltage reading from the plug that turns on the compressor clutch. if you get a reading from that terminal you know which wire is bad :? Quote
94CutlassSLCoupe Posted May 23, 2005 Author Report Posted May 23, 2005 well it really isn't that bad BUT it is pissing me off.... since my car only has 27,000 miles on it I kinda want the A/C to work!!! Quote
cutlsp Posted May 23, 2005 Report Posted May 23, 2005 well it really isn't that bad BUT it is pissing me off.... since my car only has 27,000 miles on it I kinda want the A/C to work!!! i hear that and i hate pissing gas on the fire here but my cutlass has 228k miles on it and the a/c was converted in 92(104k) all its ever had is recharges from that point. :oops: Quote
rudefyet Posted May 23, 2005 Report Posted May 23, 2005 I found an a/c compressor clutch laying in my front yard yesterday. Perhaps it's yours? Quote
94CutlassSLCoupe Posted May 23, 2005 Author Report Posted May 23, 2005 no i didn't...lol its still attached! Quote
mdelorie Posted July 31, 2005 Report Posted July 31, 2005 I've got the same thing happening on my 91 Lumina. I don't even know where the low pressure cutoff switch is... I just know the clutch isn't engaging. on the compressor plug, there's two wires, a green and a black. there's some continuity between them, which I'm thinking isn't the way it's supposed to be. is the black wire supposed to be ground and the green a 12V? The relay tests out good (swapped the fan relays with it, etc.) I just want to see what's supposed to be on these two wires before I go dumping 12Vs on to the compressor. Any thoughts? There's continuity also between the output on the relay plug and the compressor plug. Thanks Quote
1990lumina Posted July 31, 2005 Report Posted July 31, 2005 All I know is the ECM won't let the clutch engage if the pressure in the compressor is to low. Quote
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