Question about 2001 GMC Sierra Crew Cab

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Heater stuck on full heat

2001 GMC Sierra. Heater is stuck on full heat. It is not responding when I turn the dial to make colder. It does not respond when I turn the A/C on. How can I fix this?

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  • pnws6 Mar 30, 2009

    I have the same problem

  • pnws6 Mar 30, 2009

    I have the same problem

  • Anonymous Mar 31, 2014

    Why is my Heater stuck on full with temp dial on coolest setting?

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Did you ever find a solution to this problem? My 2001 Sierra does the same thing; if I turn on the heat to full hot it remains stuck for a while. Sometimes it sticks for a couple of minutes, other times it sticks for a couple of days. As long as I don't turn it fully to hot though, it doesn't stick. It has gotten worse recently.

Posted on Mar 13, 2011

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If you dont hear a switch over when you turn dial the system probly needs a charge possibly low pressure.if its just the dial knob need to open the panel and see if its making contact while turning knob see if it switches.

Posted on Mar 30, 2009

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SOURCE: 2000 GMC Sierra 5.3L. Heater is stuck on full

sounds like you have a bad actuator motor that is what moves the door in heater box to change from hot to cold

Posted on Jan 30, 2010

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Hi Dennis, I'm glad to help!

Dennis, there are only 4 possibilities when you have NO Heat. (1) Your are low on coolant. Check your Radiator and see if it is full. (2) The heater core is clogged. First run the engine until it reaches operating temperature with your heater turned on, then grab one heater hose and compare it to the other. If it's clogged one will be extremely hot and the other somewhat warm. If it's not clogged both will be extremely hot. (3) You could have a blend door problem. Which means the door could be stuck in the colder side. It also could be broken or the motor is bad. (4) The control head could be bad and not actuating the door. If you like call me 314-374-5218 I'm in St Peters. Hope this helps and have an awesome day Dennis.

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