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2002 Toyota Highlander Question: Airconditioner works sometimes/ warm/hot air blows when the fan is off

 

Question

jimixxx, 2.4L 4 Cylinder, San Jose, CA, May 08, 2009, 16:43
 Rookie

I just bought the SUV in January. I checked the AC while buying the car and it was blowing cool air. I didn,t use it till about 6 weeks ago. It, wasn't working so I took it to a oil changing/general maintance type shop. They recharged the system. It does work sometimes maybe for 15-30 minutes. Sometimes switching the cold/heat switch to hot and then back will get it too start blowing cold air. This may be just coincidence.Also: the shop put leak detector and I see no die denoting a leak.

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  • Answer #1

    munkyrench September 22, 2009, 16:52
     Master

    hello,
    did you find out what was causing the A/C to stop working? Was it a problem with the compressor or a pressure sensor?
    look forward to hearing about the solution, thank you!

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  • Answer #2

    Dan-O November 09, 2009, 16:30
     Rookie

    I had the same problem with intermittent working. I found something on the web and tried it. Take the temperature control knob off (be careful prying to not scratch the area). Beneath there you will see the stem that holds the knob. There is a nut on the stem. It had gotten loose and was causing the control module to rotate a little and mess with the wiring behind it. I tightened it, put it back together and it appears to be working OK now. Took me 10 minutes. If the wires are damaged too badly then you will either have to pull it and try your hand at soldering or have it replaced (I got an estimate for about $700).

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    Visitor, July 06, 2010, 17:32

    Thank you so much!!!!! Turning that little nut on the shaft (I just tightened it with my fingers) solved my problem in two minutes. Oh what a life saver you are!
    TKS
    Pat

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    Visitor, July 30, 2010, 14:10

    I have had a similiar situation where the heat would cycle on and off (this would happen whether the air was on or off). I thought it was an errant blend door until I happened upon this site. I pulled the knob off in question and it was loose. I tightened it and now have my fingers crossed that this will solve my problem.

    TKS

    Matt

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  • Answer #3

    Visitor, June 11, 2010, 20:29

    I WORK FOR A TOYOTA DEALERSHIP AND THE PROBLEM IS IN THE TEMP CONTROL SIWTCH, THEY DO GO BAD, THE SWITCH COST AROUND $600.00 YOU HAVE TO BUY THE WHOLE CONTROL PANEL. CANT BUY JUST THE SWITCH. SORRY

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  • Answer #4

    Visitor, August 11, 2010, 14:42

    that my friend is the heater core valve is what allows the flow of hot air and cold air to the cab

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