1999 Chevrolet S-10 Heat and Air

RF1661

MEMBER
1999 CHEVROLET S-10
4.3L
V6
2WD
AUTOMATIC
195,000 MILES

My heater quit blowing hot air and my ac quit blowing cold air. I checked all fuses and no bad ones. I check all fuses and relays on drivers side under the hood. I changed the control panel inside the cab in the dash. When I turn ac on the compressor does not kick in but it has the right amount of Freon pressure. It just blows warm air. When I switch to heat it blows cold air. What is the problem?

4 Replies

JACOBANDNICKOLAS

MECHANIC
109,645 POSTS

Have you checked the blend air door?

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Thursday, October 16th, 2014 AT 7:30 PM

RF1661

MEMBER
4 POSTS

No I have not. Where is it located? Is it powered by electric or vacuum?

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Friday, October 17th, 2014 AT 10:26 AM

RF1661

MEMBER
4 POSTS

Will this cause the ac compressor not to kick in?

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Friday, October 17th, 2014 AT 10:27 AM

JACOBANDNICKOLAS

MECHANIC
109,645 POSTS

I believe this is an electrically controlled one. It is located near the hear core box and not fun to get to. As far as the AC, this shouldn't cause the issue. However, once we get the heat to work all the time, then we can move to the AC. It could be a cycle switch, clutch, power supply issue.

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Friday, October 17th, 2014 AT 5:29 PM