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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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#21 of 118 2001 GMC Jimmy- NO HEAT!!! by dizzyjonez Feb 16, 2007 (1:30 pm)
Does anyone know if a 2001 GMC Jimmy has a Heater Control Valve? If it does, could someone point me to where it might be located. If there isn't one...I have no idea why I'm not getting any heat. The flapper that controls the incoming works fine, the thermostat was changed, the radiator cap was changed, the heater core was flushed and then the entire system was flushed, all debris has been cleared away from the air intake...is there anything else that I'm missing? I guess I'll have to cave and take it in to get it looke at...Ugh! Replies to this message: repairdog (Feb 16, 2007 2:11 pm)
#22 of 118 Re: 2001 GMC Jimmy Heater Problems [dizzyjonez] by repairdog Feb 16, 2007 (2:07 pm)
Replying to: dizzyjonez (Feb 16, 2007 5:17 am) Yes, thru the glove box you can get to that blend door.
#23 of 118 Re: 2001 GMC Jimmy- NO HEAT!!! [dizzyjonez] by repairdog Feb 16, 2007 (2:11 pm)
Replying to: dizzyjonez (Feb 16, 2007 1:30 pm) No valve - the coolant always flows thru the core (if not clogged). Is the system in defrost cause thats default with a rotten vac line. Then if Auto climate add the electric blend door thats got a palestic gear.
#24 of 118 Re: 2001 GMC Jimmy Heater Problems [cj4258] by repairdog Feb 16, 2007 (2:19 pm)
Replying to: cj4258 (Feb 16, 2007 11:29 am) OK - go but a 3/4 to 5/8" adapter at the auto store they all sell them about $3 and pull the heater hoses at the firewall and bypass it - no heat of couse until the core is done and yes they gave you the going price. If you are not going to fix now flush that leaky core with water so the smell will lessen. Then refill the reservior and see if it remains stable. Refill the radiator and the res when cold. Fill res to the hot line and check at same temp everyday to see.   If it drops and the hoses/water pump do not leak, and lifters tap on startup, most likely the lower intake and again thats the current rate.   Dex cool requires changing 3/36 and the GM BS of 5/100 causes this. Air in the system creates a mess and the wrong mix (50% correct) causes a voltage diff that eats the core. The GM cap was crap design also so get a Stant plus change the thermostat at the same time. Hope the waterpump doesn't start to leak soon too as all the crap in the system often gets in the seals and bearing.
#26 of 118 '98 Blazer Lt 4x4 blowing constant heat by wnewcomb May 10, 2007 (5:57 pm)
My blazer blows constant heat. The heat blows at the highest setting and no matter what I do to the climate control buttons, it still blows even when all settings are turned off. I believe the problem could be the air blend door actuator. I already have the part so that I may replace it, but I can not figure out where exactly the part is behind the dash in order to replace it. If someone could give me a detailed explaination as to the exact location of this part in the vehicle I would appreciate it. Replies to this message: repairdog (May 11, 2007 1:05 pm)
#27 of 118 Re: '98 Blazer Lt 4x4 blowing constant heat [wnewcomb] by repairdog May 11, 2007 (1:05 pm)
Replying to: wnewcomb (May 10, 2007 5:57 pm) Are you installing the electric blend motor on an auto climate control with temps in degrees on the dials and auto positions? If so reach up and grab the little tab behind the glove box left side and pull it in then the box swings out and down. Its on top of the heater/AC bow.   Found some info on another forum and summerized below: Remove the vac line that enters and then move the the vac assembly. Remove the electrical connector that feeds the Actuator. With a 7/32" remove the two (2) mounting screws. There is no screw on the back mounting post, just a pin that holds it steady. Pry the Actuator up off the blend door with a screwdriver. Install new one.
#28 of 118 Too much heat! by focker1993 Jul 21, 2007 (11:50 am)
I have a 1999 Chevy Blazer with the climate control. The problem is with my heat, it never stops. It constantly blows heat out of the vents. I can still change the direction ( defrost, floor, vents) and the speed of the blower, but cannot shut it off. The AC will not come on, the light comes on, but never any cold air, which I am thinking that it has something to do with this. I am looking for any suggestions please. It is hot outside and is unbearable sometimes to drive. Thank you very much
#30 of 118 2000 blazer - Heater always blows hot by ioldanach Aug 01, 2007 (5:25 am)
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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