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Chevrolet Blazer Heating Ventilation and Air Conditioning

118 messages,  Last post on Nov 01, 2009 at 9:53 AM

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What is this discussion about? Chevrolet, Heating / Cooling, SUV


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#70 of 118
A/C Compressor Clutch not getting power by hyperhtml
Apr 18, 2008 (1:48 pm)
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My 1997 Chevy Blazer Compressor Clutch does not get any power when i turn on the A/C in the car...
 
What could the issue be?
#71 of 118
Re: A/C Compressor Clutch not getting power [hyperhtml] by jlflemmons
Apr 19, 2008 (4:12 pm)
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Replying to: hyperhtml (Apr 18, 2008 1:48 pm)

Low freon. There is a pressure switch on the side of the dryer (large silver canister near the firewall on the passenger side. If the freon charge is low, the pressure switch shuts down power to the clutch to protect the compressor.
 
There are two small round metal and rubber high pressure gaskets about the size of a water hose gasket but thinner that are where the two aluminum tubes bolt to the top of the compressor. These seals can slowly leak causing a freon loss. If you decide to just add freon, use the freon without oil as you haven't lost the oil from the system. If you decide to change the seals, you should have a vacuum drawn on the system before recharging. That way you get all the moisture out.
#72 of 118
2002 Chevrolet Blazer heater problems by juliemact
Apr 30, 2008 (9:20 am)
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Help,
 
My heater only works sometimes. More specifically, the blower works but only blows cold air. When I don't need the heater, it works just fine. The temperature gage occasionally reads high. I have also noticed that sometimes, when the fan switch and the heat/AC/Fan selector switch is turned off, there will be heat coming out of the vents (small amount). When I flip the fan and heater switches on; the air turns cold. When this has happened before I have changed the thermostat. This time a new thermostat did not fix the problem. What else should I consider checking?
 
Julie
#73 of 118
Re: 2002 Chevrolet Blazer heater problems [juliemact] by jlflemmons
Apr 30, 2008 (10:50 am)
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Replying to: juliemact (Apr 30, 2008 9:20 am)

How many miles on the Blazer, and has the antifreeze been changed and cooling system flushed. Very important, this vehicle uses the long life Dexcool antifreeze and cannot be mixed with conventional ethalene glycol (the green stuff).
#74 of 118
Re: 2002 Chevrolet Blazer heater problems [jlflemmons] by juliemact
Apr 30, 2008 (1:34 pm)
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Replying to: jlflemmons (Apr 30, 2008 10:50 am)

It has 120,000 miles and yes I still use the orange antifreeze. It has been flushed and the heater core was replaced in December.
 
Julie
#75 of 118
Re: 2002 Chevrolet Blazer heater problems [juliemact] by jlflemmons
Apr 30, 2008 (6:45 pm)
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Replying to: juliemact (Apr 30, 2008 1:34 pm)

Julie, there is an air mix damper in the ductwork under the dash. I haven't had to work in this area, but it does sound like it could be your problem. These vehicles do not have the conventional heater control valve, so water is always flowing through the heater core. Anybody who has done work on this feel free to jump in here.
 
Curious about the temp gauge, though. When you start from cold, the gauge will go up just above normal for a minute or so, and then should drop back to normal. What this indicates is the point at which the thermostat opens.
#76 of 118
Re: 2002 Chevrolet Blazer heater problems [jlflemmons] by juliemact
May 01, 2008 (8:09 am)
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Replying to: jlflemmons (Apr 30, 2008 6:45 pm)

Thanks for your reply, I'll look into the damper. The temperature gauge has been going higher than it normally does, more like it's about to overheat, until I hit the interstate and begin to accelerate, then it lowers back to normal.
#77 of 118
Re: 2002 Chevrolet Blazer heater problems [juliemact] by jlflemmons
May 01, 2008 (3:07 pm)
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Replying to: juliemact (May 01, 2008 8:09 am)

I know this sounds stupid, but are you sure the cooling system is full? Each of the issues you discribed can also show up with air in the cooling system. When you accelerate hard, do you hear gurgling in the area over under the glove box (heater core)?

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