Heat is always on!

[[RIT]IVIr_Evil]

Ever since I bought the Blazer I noticed my feet always getting hot. Now I noticed that its because the heat is always on. The blower is always blowing or something.. I put the temp control to the coldest setting and I turn the main control to the OFF positon.. And I still get hot air. Any suggestions?
Thanks
- Tom

[chcknugget]

I think it may be your blending door. I've never had the problem, but I would do a search for that.

[dmbrisket 51]

put a ball valve on the heater core, if you wanna feel good about it, put one that is either stright flow or 90, put one one both sides and connect with hose,

[BlazerLT]

Originally Posted by dmbrisket 51

put a ball valve on the heater core, if you wanna feel good about it, put one that is either stright flow or 90, put one one both sides and connect with hose,

What? The blending door is electric.

[dmbrisket 51]

yes it is, but cut off supply of coolent to heater core and no more heat! not sure of his year, but mine (98 pu) is vacume acuated, and i dont plan on fixing it untill the moter swap, to much work for a 20 min. "cheating" fix, i do open it up once a week in the summer and let coolent circulate through it

[BlazerLT]

Originally Posted by dmbrisket 51

yes it is, but cut off supply of coolent to heater core and no more heat! not sure of his year, but mine (98 pu) is vacume acuated, and i dont plan on fixing it untill the moter swap, to much work for a 20 min. "cheating" fix, i do open it up once a week in the summer and let coolent circulate through it

No, you fix the actual problem, not divert coolant flow to fix it.

Your blending door is NOT vacuum operated, it is electric.

[dmbrisket 51]

sorry should have stated that better, i know the blend door is electricly controlled, but there is a vaccume switch back there gone bad (not sure what its for, one problem i accually didnt look into myselfe) and that the heat is on due to this, so i just shut the flow off, plunty of people have done it, and ive seen a few write ups on it, i know its not the correct fix, but it works, and i dont feel like getting back to that point...yet, i will fix it correctly this summer, but i wasnt taring it apart between late augest after school started and winter, i wouldnt of finished

[Rick Norwood]

BlazerLT, I have the exact same issue on my 2000 Jimmy SLE. I have heard of this blending door too many times, but don't know exactly where it is or how to get to it. I have been told that the foam strips could have fallen off completely the door, or at least slipped causing the door to stay partially open. I know it is fighting the air conditioner. Do you think you could enlighten an old dumb guy? Exactly where the heck is this thing.

[[RIT]IVIr_Evil]

Thanks everyone... I'll have to check the blending door issue... and get back to this post after I see if thats the problem.
thanks
-Tom

[BlazerLT]

Originally Posted by Rick Norwood

BlazerLT, I have the exact same issue on my 2000 Jimmy SLE. I have heard of this blending door too many times, but don't know exactly where it is or how to get to it. I have been told that the foam strips could have fallen off completely the door, or at least slipped causing the door to stay partially open. I know it is fighting the air conditioner. Do you think you could enlighten an old dumb guy? Exactly where the heck is this thing.

I will be completely honest with you, I have never worked on the blending door personally.

Just don't want you to think I didn't get your post.

Maybe others have more intimate knowledge on its' location.

Help Rick out guys.

[rksnc]

The actuator motor is locatedon top of heater case. Remove instrument panel. Unplug electrial connector. Removeactuator motor. To install, reverse removal procedure. I think the vacumm line you see is for the fresh air door. This open close to take outside air in, in recycle mode this door opens to take air from inside.

[[RIT]IVIr_Evil]

I have a 99 blazer and I noticed that I don't have a recylce mode on my Instrument Panal for AIR/HEAT.. I looked at my buddies 99 Jimmy and he was having the same problem, but he has a recycle button, when pushed the problem goes away, causing no airflow/no extra heat. Therefore is there a way I can switch out panals from a wrecked 99 Jimmy or another Blazer if others have the recylce function?

[chris15706]

I got the same problem. Both my 2000 s-10 and 2004 blazer does the same thing. When everything is off it blows a slow stream of hot air. I just keep the top vents turned on so it wont blow on my feet. Anybody know of a fix?

[dwitczak]

On my 96 blazer I had to replace the blend door motor. It really is not too bad. As previously stated you need to remove the dash completely. Again that is not too bad. Then remove the heater core. Behind the heater core and just below the metal part of the fire wall (below the window) and just on top and slightly behind right side of the air housing (behind the heater core) the is the blend door motor. About 55.00 from GM. There are 3 screws that can be a real pain to get out. I used phillips bit (the type that slides in a 1/4" bit). Believe this a very dueable job. It can be done in about 4 hours total. *****caution*****. I do not know how to take the instrument panel frame off without breaking the flasher button. If you do break it, you need to replace the entire turn signal switch which cost me $100 at the junk yard. Good luck and email me if you have question when doing it. You guys were such good help to me, I hope I can return the favor.

[2000blazerls]

My Blazer does this same thing. Kind of annoying all summer and I could fix it but with fall/winter coming up, I might as well wait till next spring!