Question about 2005 Toyota Highlander

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When I turn on the A/C hot air is blowing from the vents. This feels like heat and not outside air. Any idea what is going on?

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I forgot where it is but someone has a solution on the web with pictures showing how to fix this problem. I have very little repair ability and I was able to do the repair. I needed to take one part in to get it soldered but the cost was $20 compared to $400 from the dealer.

Posted on Sep 06, 2010

  • l7d7s7 Jun 21, 2011

    I took it to the dealer and they charged me for a relay which did not fix the problem. The fix was to take off the termperature knob (just squeeze and pull) then tighten the nut.

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1 Answer

Air cinditioning wont stay on, it switches to heat and wont shut off


What do you mean when you say it wont shut off? is it blowing hot air or do you just feel a lite flow of hot air even if you have the settings to cold?

If this is the problem that you always feel hot air at low flow and the ac goes to hot air then i would say one of two things, first if you have the selector to cold and you feel hot air then there may be a problem with the blend door, this door move to allow hot or cold air, the door may be broken or just a bad motor that controls it. keep in mind if the ac system shuts down for any reason the air then will be warm, it will be about the same temp as outside and maybe a little hotter.

this problem almost sounds like the ac compressor shuts off and then you are getting the outside air which is hot, there are many reasons for the compressor to shut off, it could be the compressor clutch heating up and disengaging , this would be due to a bad compressor clutch.

another reason is the fans are not working, the best thing to do is when the system starts to blow warm check and see if the compressor is running, start engine and look at the front of compressor, with ac off the front of it will not move, and then with ac on the front will spin, check it out and let me know, if it blows warm air and ac is not working then it may be compressor problem but if you are getting warm air and the compressor is spinning then it may be a door problem.

This is hard to check with out testing the system, so i listed a few things to check and let me know the out come. also the ac blows cold for how long before it gets hot air blowing out of the vents, good day.

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