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heater control

eyehunter78
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eyehunter78 Enthusiast

eyehunter78

Posted
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I'm asking this for a friend. He owns a 2001 Chevy Subyuban and he can not control the temp it only blows hot air all the time if in off. Could this be the warm/cold switch that has gone bad or ?? Any help would be great as he would like to try and fix it himself. Thanks again.....

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K_Josh87 Experienced

K_Josh87

Posted
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Possible vacuum line issue? i do not know what chevys system is but Ford likes to use them, and IMO they are retarded... one comes off and the 4x4 won't work, and it defaults to defrost... Not sure what chevys have in them, but it'd be the first place i looked on a ford...

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Jeremy airjer W Grand Master

Jeremy airjer W

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I'm asking this for a friend. He owns a 2001 Chevy Subyuban and he can not control the temp it only blows hot air all the time if in off.

Could you clarify this. The part that I don't understand is "it only blows hot air all the time if in off"? If what's in off?

There are no vacuum lines, it's all electronic.

Is this manual or automatic HVAC?

I would bet that the blend door actuator or the blend door itself but the HVAC module is a possibility. I'm thinking a scan tool would be the best bet to get some data on what the module is trying to do.

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hanson Grand Master

hanson

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Posted

Thats a blend door actuator (hot/cold).

Went through this on my 99 Sierra last summer and got everything fixed. First it was the blower motor resistor - fan only worked on high. Then it was my mode actuator (defrost/panel/floor/ect). And about the same time lost my control of hot/cold. So as I was driving around, I had heat coming from about everywhere, was definitely coming out the panel.

The blend door actuator is the one under the glovebox I think. Thats the easy one to replace. The other one is up above the gas pedal behind the dash, that one was a bugger.

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