Question about 2006 Toyota Highlander

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Heater/AC control no longer allows change in temperature

This is on a 2001 Toyota Highlander automatic heater/ac controller unit. When I turn the controller knob to change the temperature, the temperature remains the same. The unit blows the temperature listed on the screen but can not be changed

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  • dpattyn Apr 23, 2009

    I took the unit out and disassembled it. There did not appear to be broken wires visible to me. I was prepared to soder them, but could not see them to identify them. My unit is an automatic unit and behind the know that is used to adjust the temperature no longer changes the temp. no matter how many times I spin it

  • Anonymous Mar 23, 2014

    when the car is on the display that shows the back up, clock and temperature camera is white-no display is shown

  • Anonymous Mar 23, 2014

    center display with clock, temperature not working

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  • Toyota Master
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You have one of two possible problems.

1) The temperature shaft retention nut is loose behind the knob

2.) The wires to the potentiometer part of the temperature may be broken.

Either one is common to this vehicle. The replacement of the AC controller is about 900 dollars. If the wires are broken, they can easily be reattached to the circuit board via soldering. What you would have to do is remove the control box from the dash, and disassemble it. Once the unit is apart, there are 3 wires from the temp knob to the circuit board that need to be re-soldered. The unit CAN be repaired, as opposed to the expense of replacing it.

Posted on Apr 23, 2009

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Based on the limited information provided, it would appear you have a bad climate control control board. This controls all heater/AC functions including climate control. If you're unable to change temperatures and/or fan speeds, the board is most likely bad and needs replacement.

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HIGHLANDER "NO-HEAT" CONDITION (W/O Automatic Air)


Does your Toyota Highlander have no heat?
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If the retainer nut is loose, the unit can be repaired. This will entail removal of the heater control from the dash, disassembling it, identifying the broken wire, and resoldering the broken wire back in place.

If you are not skilled in disassembling the dash and the heater control, and not skilled in soldering, this job is best left to a professional. The alternative ti repairing the broken wire is costly. The replacement control is roughly 900 dollars, plus installation. A qualified technician can repair your control in less than 2 hours.
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Very common problem that is a manufacturer defect that should've been recalled due to the sheer volume of people having problems with this. It's likely a ribbon style 3-conductor wire that has likely broken just behind the actual knob. Having this fixed is a very expensive job virtually anywhere you go. Some places were quoting 700.00 and I even heard some owner claiming they were qouted upwards of 1,300.00 However I found a really outstanding deal on ebay for a rebuild service. You remove the climate control unit, send it in to the business, they rebuild/fix what is wrong with it, test it and ship it back to you. I had mine back in exactly 7 days from the day I removed it and shipped it out and all for about 80 bucks. Very professional work and was very relieved.
http://www.ebay.com/itm/2003-TOYOTA-HIGHLANDER-MANUAL-CLIMATE-CONTROL-REBUILD-HEATER-AC-REPAIR-SERVICE-/110977619956?pt=Automotive_Services&hash=item19d6c817f4

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1 Answer

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I'm glad I could help. I'm reposting the solution below in case anyone needs it in the future. Please be sure to rate it for me!

Pull the temperature knob off and verify the thin 12mm nut is installed and tight behind it. I have seen several of these loosen up allowing the knob to turn but intermittently have no effect on temperature.

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A FIXYA rating (4 blue diamonds) would be most appreciated for my assistance.

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