What are the symptoms when the a/c temperature control knob goes out?

Asked by Jul 18, 2015 at 05:49 PM about the 2005 Toyota Highlander Base

Question type: Maintenance & Repair

When I touch the temperature control knob the air will go from cold to hot and back again.
Even when I step on the brake suddenly the air will change from cold to hot. Is there a way
to tell if it is the control or something else?

3 Answers


The blend door cable has come off or has come loose. This is the door in the heater box that switches from the heater core box for heat and evaporator for A.C.

Best Answer Mark helpful

I had a similar problem when i bought my Demo 2005 Highlander. After taking to the dealer twice, i decided to explore behind the temp. control, I found then some wires from the control to the electronic board were broke because of bad installation at the factory. I unsolder the wires from the board rearrange the harness to relieif strain on the bundled wires to the board and resolder the wires. One problem gone (Disclosure- I was trained as an electronic technician in the USAF). I hope it solves your problem.

Some conetion on the nob is detached. Meaning the soldering is out . Will need to open the panel that holds the nobs and then solder them back. That why it keep on going on and off because when you hit the break it possibility touches the connection and the come off. Try that I did it to my car and it worked. Never had problem again. Good luck. Francis.

Your Answer


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