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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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#31 of 118 1998 GMC Jimmy heater is not working properly by answer987 Aug 02, 2007 (6:01 pm)
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?
#33 of 118 Chevy Blazer heater flapper by stang_girl87 Feb 17, 2007 (5:08 pm)
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. Replies to this message: repairdog (Feb 18, 2007 3:37 am) stang_girl87 (Feb 18, 2007 4:48 pm) delbiage (Mar 03, 2007 10:04 pm) and 1 more...
#34 of 118 Re: Chevy Blazer heater flapper [stang_girl87] by repairdog Feb 18, 2007 (3:37 am)
Replying to: stang_girl87 (Feb 17, 2007 5:08 pm) When you had the heater box apart would have been the time assuming you reinstalled it correctly. You should be able to move it thru the glove box. If in defrost thats the lose of vac default so look under hood at the drivers side last plastic line in the rubber series and see if all 5/32 lines are good to it. If an LT with climate control (temps on dials and auto postions) also have the electric blend motor that is another door. Replies to this message: stang_girl87 (Feb 18, 2007 4:48 pm) delbiage (Mar 03, 2007 10:04 pm) repairdog (Mar 04, 2007 1:45 am)
#35 of 118 Re: Chevy Blazer heater flapper [repairdog] by stang_girl87 Feb 18, 2007 (4:48 pm)
Replying to: repairdog (Feb 18, 2007 3:37 am) Thanks! Got it fixed now! Replies to this message: delbiage (Mar 03, 2007 10:04 pm) repairdog (Mar 04, 2007 1:45 am)
#36 of 118 Re: Chevy Blazer heater flapper [stang_girl87] by delbiage Mar 03, 2007 (10:04 pm)
Replying to: stang_girl87 (Feb 18, 2007 4:48 pm) I think I might be having a similar problem.   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? Replies to this message: repairdog (Mar 04, 2007 1:45 am)
#37 of 118 Re: Chevy Blazer heater flapper [delbiage] by repairdog Mar 04, 2007 (1:45 am)
Replying to: delbiage (Mar 03, 2007 10:04 pm) The electric blend motor (witha plastic gear) is probably trashed and I would strongly suggest the dealer on this - many other shops do not understand these and will actually cost more to determine and change - its behind the glove box and cycles the door between the AC and heater core based on the temp selected.   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.
#38 of 118 Broken heater door in 2000 blazer 4wd. by olddoc Apr 14, 2007 (1:42 am)
#39 of 118 Broken heater door in 2000 blazer 4wd. by olddoc Apr 13, 2007 (5:02 pm)
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 Replies to this message: repairdog (Apr 14, 2007 1:41 am)
#40 of 118 Re: Broken heater door in 2000 blazer 4wd. [olddoc] by repairdog Apr 14, 2007 (1:41 am)
Replying to: olddoc (Apr 13, 2007 5:02 pm) That air box requires the dash be pulled to get completely out if the internal door is jamming - but have to ask is this an LT with auto climate control (temps on dials and auto positions)? If so there is an additional electric blend motor accessible thru the glove box atop the air box that often fails. If not also look under hood at the drivers side vac lines 5/32" that run to the reservior in the fender and the last T in the system is a plastic line to the heater controls - rotted rubber lines may be causing the door to open then flip back as vac drops due to pressure and default for door is defrost.

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