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Heater Stays On....

chud53

By chud53
in Ask A GM Technician

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chud53 Enthusiast

chud53

Posted
Posted

just wondering what could be causing this, but it's really weird ill be driving with the heater on and i get hot and wanna turn the heater off so i turn it off and turn the Temp. dial to cold but yet the vents still have hot air coming into the truck, im not sure what is causing this. And no im not an idiot this has been happening for awhile and im wondering how i can fix it. Thanks for any input

s2gots Enthusiast

s2gots

Posted
Posted

same issues here, I replaced the heater door actuator, I think thats what its called. Now I get cold air on the cold side of the knob, and hot on the hot side. But no blending of the temp which is kinda stupid. I think I have a fulty new actuator......

drumset5994 Enthusiast

drumset5994

Posted
Posted

At least you have actuators.

 

Mine is manual. Manual as in, you can hear the door flap turn as you turn the indicator.

 

Kinda nice for no vaccum, but there never is a true setting...you can always still feel air coming out of every duct.

chud53 Enthusiast

chud53

Posted
  • Author
Posted

yeah thats how mine is, the air never really shuts off. I can still feel the hot air coming through the vents even though its off. WTF!!!

tcas1355 Enthusiast

tcas1355

Posted
Posted

Sounds like a common problem since mine does the same thing. Mine only does it once in a while though. It's very irritating because when you turn the fan OFF, air still comes out, and if it's hot, the truck gets very hot. I remember a couple threads about this problem, but I can't find them.

officegig Enthusiast

officegig

Posted
Posted

Mine does this too. It doesn't happen all the time and sometime when it does I can apply outward pressure to the temp dial and make it cool down, other times I have to stop the engine for a while and it will work again. Also, when it does do it, it really gets hot. Hotter then I can make the heat go when it is functioning properly. ????

wht2500hd... Enthusiast

wht2500hd...

Posted
Posted

I don't know how plenum doors work on my truck - they can be cable, vacuum or solenoid controlled. The only way to learn how to close off hot doors to the heater coil is to get under the dash and observe the doors while you or a helper activates the controls. You can also buy the trucks manuals and get a good description of how they work.

 

Sometimes a plenum door can be jammed by a wire; or a vacuum actuator may be leaking vacuum or may be disconnected. Check fuses too.

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