Question about 2003 Toyota Highlander

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Heater does not work and check engine light is on

I turn the heater on and only cold air comes out. The air conditioner works perfect.

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  • tsmith2305 Nov 30, 2008

    i have same problem heater and gage wont heat up i replaced thermastat and antifreeze heater control valve works heater core is not plug let it run with radiator cap off for hour and a half somebody said air was in the line nothing works any help thanks tom

  • bhtto Dec 02, 2008

    My wife just called this morning with the same problem on her way to work. She said that it was blowing fine, and she was getting warm, so she just turned the fan down. Then, she felt like cold air was coming in, so she turned the fan back on high...no heat, just cold air.

  • Anonymous Dec 19, 2008

    I had the same problem (cold air only). I removed the knob for the heat control, and tightened the nut. This helped for a day or 2, but then it was back to cold air. A mechanic told me to try hitting the control knob. When I did, it actually made it colder. I took the knob off again, and if I push down on the bolt that sticks out, it gives hot air, but I can't find a way to keep it in this position permanently. The mechanic told me that the heat control unit may have to be replaced. It's $750 part (plus labor)!

  • Serge Rousseau Feb 28, 2009

    no heat at all

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Please see
http://www.tundrasolutions.com/forums/highlander/32217-heater-quit-sort-of/
It's usually broken solder joints on a cable behind, and feeding, the temperature knob.
I repaired my 2002 Highlander yesterday thanks to this site.

Posted on Jan 21, 2009

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I have the same problem

Posted on Feb 28, 2009

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Wow, I have the same problem, heater blows out cold air and AC works fine. All of the whack jobs at work told me repeatedly your thermostat is bad. I changed it even though i felt like that wasn't it, and low and behold the same problems exist (no heat). Whats the next step? someone at the auto part store said try the heater Valve.

Posted on Nov 23, 2008

  • bigbard Dec 03, 2008

    I fixed it, it was actually the knob itself (the hot/cold switch).

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