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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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#83 of 118 Loss of heat-overheating by graceless_lady May 10, 2008 (7:12 pm)
Hey! Help would be much appreciated from anyone who can help.... My '99 2DR Chevy Blazer has already had a new water pump installed...just about 5 months ago. About 3 months ago, (during the COLD of PA winter...haha) I noticed that my heater was not working. It seems when I am driving about 55 mph or less, it just will not work, and then the temp shoots up to about 240. However, my drive to work is about 45 minutes, and a good portion of that is on an interstate with a speed limit of 65. When I am going that fast, the temp drops down, and magically I have heat again. When it first happened back in probably January, my husband replaced the thermostat (easy fix) and it worked like a charm until probably about late March. Then the same thing started happening again. Any ideas? I would be very appreciative!!! Thanks!
#84 of 118 Vent Control Problem with '88 S10 Chevy Blazer by jbil Jun 28, 2008 (5:26 pm)
The heater/AC on my '88 S10 Chevy Blazer blows hot/cold air well. However, when I adjust the selector to any of the AC choices, the air only blows on the floor rather than the dash vents.   I've checked to see that the 2 vacuum hoses are connected to the heater/AC diaphragm on the floor. Maybe the other ends aren't connected.   Questions   1. Could this be the reason that the baffles don't adjust to bring the air to the dash vents?   2. If so, is there a diagram showing their location on the other side of the firewall?   3. Is there a handy "how to" cheat sheet to disassemble/reassemble the heating/AC system if it turns out that the diaphragm is bad?   My Chilton manual is lacking any information on how to troubleshoot this problem,   Thanks a million,   Jbil
#86 of 118 Air Conditioning Blowing Hot Air by mphreha Jun 26, 2008 (11:34 am)
I have 2000 Blazer that only blows hot air when the AC is on. I tried adding freon, however it seemed to be fully charged as it did not take much at all and continued to blow warm air. I'm thinking there is not a leak since it seems to be under pressure still. Could this be thermostat related? Any thoughts advice woudl be greatly appreciated. Replies to this message: jlflemmons (Jun 27, 2008 4:58 am) mphreha (Jun 27, 2008 9:58 am) bluetwinbill (Jun 27, 2008 1:14 pm) jimmy99slt (Jul 03, 2008 12:26 am)
#87 of 118 Re: Air Conditioning Blowing Hot Air [mphreha] by jlflemmons Jun 27, 2008 (4:58 am)
Replying to: mphreha (Jun 26, 2008 11:34 am) Others will have more detail, but there is a baffle in the duct work under the dash that regulates the cold/hot mix from the evaporator and heater cores. If you are sure that the freon charge is correct, this may be where the problem is.   When you say the air is hot, do you mean hot like in ambient outside, or hot as in heater? Replies to this message: mphreha (Jun 27, 2008 9:58 am)
#88 of 118 Re: Air Conditioning Blowing Hot Air [jlflemmons] by mphreha Jun 27, 2008 (9:58 am)
Replying to: jlflemmons (Jun 27, 2008 4:58 am) I'm pretty sure that the freon charge is correct. We tested the pressure before and it was already in the blue/acceptable level, so we were not able to add much more. The hot air feels more like heater heat and not ambient heat.
#89 of 118 Re: Air Conditioning Blowing Hot Air [mphreha] by bluetwinbill Jun 27, 2008 (1:14 pm)
Replying to: mphreha (Jun 26, 2008 11:34 am) Soounds like the AC clutch not kicking in as I had same problem and neighbor shows me how to "fix". The is on the right when looking at the engine, it looks like the underside of a oil filter. Anyway it is round and is supposed to spin, when ac kicks on. I guess its an electromagnetic thing which i know nothing about. Anyway just touch it with your finger or a stick real quick and it takes off spinning, at least mine did. So min works like 75% of the time. Every once in a while have to use the stick to get it going. Can you tell I'm not a mechanic? Wonder how much will cost to fix right.
#90 of 118 Re: Air Conditioning Blowing Hot Air [mphreha] by jimmy99slt Jul 03, 2008 (12:26 am)
Replying to: mphreha (Jun 26, 2008 11:34 am) If your compressor is spinning and you have the automatic climate control, see air blend motor/actuator. If you don't find it in the blazer side check gmc jimmy. Its hidden behind the glovebox up and to the left. Did you ever hear a funny clicking from over there?

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