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SUVs Chevrolet Blazer Chevrolet Blazer Heating Ventilation and Air Conditioning
118 messages, Last post on Nov 01, 2009 at 9:53 AM
You are in the Chevrolet Blazer Forum. Your Hosts are steve_ & tidester
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I have a blazer with a heater core that got replaced last winter. Since then, it has only blown heat, no cold. It'll switch vents just fine but regardless of where I have the temp dial it only blows hot. The temp dial is just a blue line and red line, no indexed numbers. Could it be the temperature dial? I'm not thinking so, but I don't know what voltages to look for to see if its working right. I expect it is the temperature (air blend door) actuator, and I *think* I can see where it is. If I understand what it looks like, then if I open the glovebox and move the vacuum controlled actuator I see there, (I believe this one's for the footwell?) then I can look up behind there and see it. Is there a way to test the air blend door actuator? Is there a way to get it out without removing the whole dash? |
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| The heater in my Jimmy is blowing air out but it's not hot at all. It sucks in the winter time. I just put in a brand new radiator. I had it flushed and everything. Can someone please point me in the right direction? | |
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Hey. I have a 98 Blazer that won't blow hot air. Changed heater core, thermostat, flushed the radiator. Now tore out the dash and replaced the actuator only that isn't the problem. The flapper sticks. Any advice on how to fix this problem? Thanks.
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Replying to: stang_girl87 (Feb 17, 2007 5:08 pm)
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Replying to: repairdog (Feb 18, 2007 3:37 am)
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Replying to: stang_girl87 (Feb 18, 2007 4:48 pm) I have a 1999 Blazer, Trail Blazer pacakge with auto climate control. The system will blow cold, then I'll hear something squeak in the dash and all of a sudden it blows hot. Every 10-15 iseconds t switches, hot to cold. The cycle repeats when the engine is running, regardless of what position the temperature selector is at. Is that flapper box bad? Or could it be the control unit? Any advice?
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Replying to: delbiage (Mar 03, 2007 10:04 pm) Try rotating the knobs to see if the contacts are dirty and this may clean them and see if running at all cold or hot stops the cycling. I never use that auto fan position cause I hate it ramping up and down. |
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If i can get the dash out and the heater air handler exposed can i get to the door near the steering column to repair it without removing the the entire heating unit. Any make do fixes that can be done without complete disassembly of the air handler?? I would welcome a manual wire. My disabled expert says the vacum motor is working and he can see it move but the door just springs back. The vacum motors behind the glove compartment are ok. Obviously i am looking at big bucks that i cannot afford. Any help or suggestions appreciated. sc
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