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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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.

Nov 16, 2011 | 2003 Toyota Highlander



Does your Toyota Highlander have no heat?
Here are two possibilities
The retainer nut for the temperature control is loose, which leads to a wire that is broken from the temperature control sub-circuit board, to the main circuit board.

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.
If you need further info, please post a question on the FixYa site.

on Dec 05, 2008 | 2005 Toyota Highlander

1 Answer

My a/C doesnt turn on at all in my 2001 toyota highlander I changed the fuse and want to change blower motor and resistor can you help

do you check for freon in your ac system. before you change anything check for any leak on your ac system good luck.

Aug 08, 2011 | 2001 Toyota Highlander

1 Answer

The temperature control knob is very loose and puts out a/c when it should be heat and heat when it should be a/c.

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.

Jan 26, 2011 | 2003 Toyota Highlander

2 Answers

The heater control on my 2001 Toyota Highlander is not working and the nut behind the heater knob is tight. Believe the problem may be the circuit board which I understand can be expensive to replace.

Once the heater control unit is removed then the connections for the knob which probably was loose at one time. There are 3 connections that break off. This is repairable by a skilled solderer as they are very close together. Otherwise it is 500+ from dealer and you don't get the whole unit, so it takes some gentleness to dissassemble that too. You might be able to find a cheaper fixed unit but I don't know of any.

Oct 20, 2009 | 2001 Toyota Highlander

1 Answer

2005 highlander heater problem

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.

Sep 11, 2009 | 2005 Toyota Highlander

2 Answers

A/C will suddenly send out heat. Fiddling with knobs seems to help. What's wrong?

You have a broken wire connection between the temperature control knob and the circuit board behind the center dash console. Vibration causes the failure and once the control knob gets loose the solder connection fails.

For someone that knows how to remove the dash unit and can re-solder a couple of new wires this fix should take no more than 1 hour. Make sure that you apply loctite to the heat control knob spindle nut when you re-assemble it.

The dealer quoted me 750 dollars to fix this issue and I found out that it's a common failure for this year. I fixed mine virtually for free but it took some tools and about an hour of my time.

Jun 02, 2009 | 2005 Toyota Highlander

1 Answer

2002 Toyota Highlander AC main control

Before tearing out the AC control, does the temp knob feel loose or wobble alot more then the fan knob? If so pull the temp knob straight off. Look at the small nut around the shaft the knob came off of. Its common for them to come loose. Just tighten it up some and reinstall the knob. Your temp will work normally now.
This fix is for the manual system not the auto ac system.

Mar 28, 2009 | 2002 Toyota Highlander

2 Answers

Dash Control Unit Replacement

You can save a LOT of money by fixing it yourself.

All that is wrong with the knob are broken wires from the knob's PC board to the main PC board on the AC control.

All you have to do is remove the AC main control, take it apart, and resolder the broken wires from the PC board with the knob on it, to the main AC pc board. There are 3 wires, any number could be broken.

If you take it apart and solder the broken wires, this WILL fix your issue. Just make sure you put the wires back exactly where they go.

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

Mar 21, 2009 | 2002 Toyota Highlander

3 Answers

Heater does not work and check engine light is on

Please see
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.

Nov 19, 2008 | 2003 Toyota Highlander

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