Question about 2004 Toyota Highlander

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Toyota 2004 Unlimited Highlander

When I go through a large puddle of water, the A/C turns off and switches to HOT air the auto and a/c buttoms begin to blink. This has been a ongoing thing since first bought. Please HELP

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  • msampayo Dec 29, 2008

    It has been to the dealership one too many times and they can't get to the problem. The say it's a sensor

  • yadayada
    yadayada May 11, 2010

    Toyota Ed said a poss RPM sensor for the A/C Compressor, is that the sensor the dealer recommended?

  • yadayada
    yadayada May 11, 2010

    this needs to go to a dealer, a free forum will never get this issue repaired, it is to weird a problem



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This is an old post but in case it helps someone else... on newer land cruisers the a/c compressor has an rpm sensor on its "belly". This sensor constantly informs the revolutions per minute (rpm) of the a/c compressor to the ECU when the a/c is running. The ECU then compares this rpm value with that of the crankshaft rpm sensor. If the two values are out of sync, the ECU interprets that there's a problem with the drive belt or the compressor itself, and it will stop the a/c and blink the a/c light on the dashboard to let you know there's a problem. In the case msampayo describes above, however, a/c light blinking when the car goes through a large poodle of water, I believe what's happening is that the water is making the drive belt slip momentarily, which the ECU reads as a drive belt problem and therefore causes it to stop the a/c. If the sensor was really faulty, the a/c would stop and the a/c light blink at random times, not only when the car wades through water. Hope this helps...

Posted on May 27, 2013

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I agree with Emissionwiz, this is a unique problem that I have not encountered. This situation is def one that merits "hands on" diagnosis;


If you want an educated "guess", (and this is ONLY a GUESS),
I would suggest replacement of the RPM sensor on the A/C compressor....HOWEVER, I would NOT guarantee that will cure your problem.

Posted on Dec 29, 2008


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