The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 98' S-10 Air Conditioning problem?

68C15 · 07-17-2009, 07:17 PM

the ECM turns off the compressor during WOT by deactivating the clutch relay. if the TPS was acting backwards you would be asking about severe driveability issues instead. after re-reading your posts i am wondering if the ECM is recieving a constant request from the control panel (bad switch on dash). it sure wouldn't be the first time I seen a bad HVAC control panel on a late model GM.

of course as luck would have it I am now home for the weekend and not at work. if someone (CORN) could remind me on Monday I can check to see which wire sends the AC request signal to the ECM. then I could post that and you can check for an intermittent open. hint-hint larry

07-17-2009, 07:17 PM	#15
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	Re: 98' S-10 Air Conditioning problem? the ECM turns off the compressor during WOT by deactivating the clutch relay. if the TPS was acting backwards you would be asking about severe driveability issues instead. after re-reading your posts i am wondering if the ECM is recieving a constant request from the control panel (bad switch on dash). it sure wouldn't be the first time I seen a bad HVAC control panel on a late model GM. of course as luck would have it I am now home for the weekend and not at work. if someone (CORN) could remind me on Monday I can check to see which wire sends the AC request signal to the ECM. then I could post that and you can check for an intermittent open. hint-hint larry