1998 Chevy Tahoe 5.7. Repairs made = new ac compressor , climate control, heater core valve,heater shut off valve Question: A/C keeps blowing hot air with rapid acceleration rear a/c stays cool.
MW: Hi Ruben, thanks for visiting. Could you give me a little more info please. On rapid accelerate, does it start to blow cold after you let off gas and stay steady? Do you hear any noises just before it starts to blow warm? Can you tell if the compressor cycles off when you hit the gas? This and any more info may be helpful for me to give some help, thanks. (Your e-mail address was returned as 'undeliverable', please re-submit)
Ruben: Thanks for responding MW. I dont have to floor it, example , jumping on the freeway, or passing a slower car. It might be a vacuum problem cause , i zipped tied the heater core valve closed and the problem went away but now no heater of course. My email is down for the moment.
MW: Sounds like you are almost there. Check that the hose has vacuum and it switches when you turn the system from heat to cool. Check that the vacuum hose is routed correctly per the underhood vacuum diagram and let me know what you find.
Question: 2003, GMC Sierra 1500HD. When using my a/c , when i come to a stop. The blowing air turns from cold to warm. When i start running again it blows cold air.
Answer: This first thing to do is haver the freon charged checked. If it is a little low, it will cause the compressor to kick off because the pressure got too low. Adding some freon will take care of that, but then you would have to look for a leak.
Another possibility is that the throttle has a lot of carbon buildup. This will cause the idle to go too low, and the computer will kick off the compressor. Normally this would be accompanied by a rough idle or even stalling.
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