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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
| I live in WI and it's getting really cold outside. Well when I turn my heat on with the blower on 1 or 2 it blows warm air if it's above freezing if it's below freezing it's cold. Anything on blower 3 or 4 it's always cold. People tell me it's the heater core and to flush it. But when I looked under the hood the hoses from the radiator go to a canister type thing and then that leads into what I think is the heater core. So if I flush it what is that canister thing and will the flush not work then. I tried looking in my manual for a name for the canister thing and can't find a name I can find a pic though. Can someone help me? | |
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I have looked at all the posts for heating problems. I have a Haynes Manual. It shows how to remove and replace items but in the trouble shootiing there is nothing as to HOW to diagnose heater issues (or how to diagnose so may other things as well.)- just bought the Blazer 2 weeks ago. Replaced a 1992 that was totalled just 3 weeks ago- loved that one..... I could afford the warranty for the drive train - but not for other things- electrical etc.Soooooooo we get plenty of air- blows very hard - have moved all the dials etc- still no heat. What should we check 1st? Also.... last Sunday the drivers windshield wiper seemed to go "off track" - it is "spastic" in its actions. the passenger one works just dandy- however they are crossing over and getting stuck on each other- Manual only shows how to change wiper blades. Do the wipers have little teeth that could be eroded like starter teeth and that is making it just not catch all the time- how do I get the wiper assembly off to check? and then what do I do with it? Thanks so much. |
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I'm having identical issues as message # 49 - I have replaced my thermostat and checked my coolant levels. I have reduced heat in my system coming out of all air supplies.I'm trying to understand if the coolant flow through my heater core is controlled by a proportioning valve to reduce / increase heat or how it is controlled. My assumptions are that the select heat / cool knob on the front of the dash is a potentiometer but I do not not what it is controlling. Any help would be appreciated. Dean Arzberger
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Replying to: toolzz (Dec 09, 2007 8:29 am) I just had mine fixed at the dealer (see message #52) as I found out that we DID have a 90 day 3000 mile warranty. It was a spring inside the radiator that regulated the water flow- it would work sometimes and sometimes not- so as we did not fix it ourselves I canot tell you the absolute specific details of the particular spring- I am sure we could have never figured that one out- we thought it was the select heatt/cool knob at first that controlled the baffle that opens the heat. Good Luck. :} Anna
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Replying to: jetson2001 (Dec 09, 2007 12:58 pm) toolzz
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Replying to: toolzz (Dec 10, 2007 6:12 pm) The spring was in the main radiator. The heater core was fine. Anna
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Replying to: jetson2001 (Dec 11, 2007 5:13 pm) Let me know Please Toolzz
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I have been trying to troubleshoot my ZR2's lack of heating. ( see message # 53 ) I have found that after the engine has reached temperature 195 deg. and I have the fan on with the heat on ( NO climate control ) I have about 165 deg. on the inlet hose to my heater core and about 109 deg. on the return line from the core.If I take the truck for a short drive I have heat coming out like I usually did. After driving approx. 5 mins. I start to loose heat out of my air supply ducts. Is this a partially plugged heater core ? I only have 58 k miles on the truck . I also noticed that with the truck ideling, the heater on / fan on 2, my A/C compressor clutch was kicking on / off sparatically. After returning from a short drive to test it, the A/C comp. did not kick in. Any help would be appreciated. Toolzz |
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| have read all the threads about the blend door & related. This 98 is on its fourth heater door, the one that directs the heat to the floor or to the defrost or the vents. The temperature is controllable so we know the "blend door" is OK, but we have little or no heat to the floor. It's a $15 part and $485 in labor since the front fender, hood and dash have to come out to replace it. At 10 years of age and 329K miles, it's still a more than serviceable vehicle, if not for this heater issue, but we would rather not dump another $500 into this door deal. I have looked at the schematics and wonder if there is some way to get at that flapper door to prop it up to allow heat to the floor area. I'm hoping that I can identify the lower box on the driver's side and carefully drill a hole that would allow me to stick a piece of coathanger, etc up to get that door up. The door's spindle is probably broken, which is what has been the case in the previous replacements. The vacuum elements are not the issue. I am working from the dealer's schematic put out by ProQuest Automotive EPC and the lower heater box that I am contemplating drilling is, I believe, # 11, in the area over the part that's labeled 14. Any help with this would be appreciated. I'm the 'house' mechanic (resp. for a 69 xk-e, 67 & 81 corvettes ">& 47 Chris Craft), so will understand any directions that are provided. | |
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