Question about 2005 Toyota Highlander

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Highlander no heat

I read your post about saving $900 on the heat controller. What is your tip?

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  • Toyota Ed May 11, 2010

    Is the control knob real loose? If so, the 3 wires that go the the control may be broken. You will need to remove the control from the dash, disassemble it, and resolder the 3 wires back onto the circuit board.


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Pull off the heater control knob, and tighten the nut that is behind it.

Posted on Feb 18, 2009

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The heating controls don't work on my 2002 Toyota Highlander, 4 cylinder SUV.

Hello. Welcome to FixYa. Please allow us to assist you.

You have one of two possible problems.

1) The retainer nut for the temperature control is loose

2) A wire is broken from the temperature control sub-circuit board to the main circuit board.

If the retainer nut is not 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 assistance, please feel free to get back to me.

Thanks for choosing FixYa today.

Nov 11, 2010 | 2002 Toyota Highlander

3 Answers

My 2005 highlander has the knobs that control the heating and coolinf fan, temperature and vent. The temperature control knob is randomly changing to hot when it is set on cold and visa versa when you turn...

Hello, and welcome to FixYa, Please allow me to assit you.

The issue that you are having is indeed in the control assembly. Yes, it does cost over 600 dollars to replace it.

However...if you have any soldering skills, or know someone that does have soldering skills, you can fix this problem yourself.

All that is wrong with the controller is a broken wire going from the small printed ciorcuit board that the knob is located on, to the controller's main PC board. Removal of the controller, and a disassembly will show you the broken wire. Just solder the wire back to the terminal that does not have a wire on it will fix you right up, AND save you 600 dollars!!!

Thanks for choosing FixYa for advice today.

Mar 30, 2010 | 2005 Toyota Highlander

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Mar 24, 2010 | 2001 Toyota Highlander

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Heater/AC control no longer allows change in temperature

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.

Apr 23, 2009 | 2006 Toyota Highlander

2 Answers

No heat 2005 highlander

try pulling off the temp. control knob and tightening the shaft nut.

Dec 21, 2008 | 2005 Toyota Highlander

1 Answer

2002 highlander vehicle shut off

I am having the same problem with a 2002 Highlander, V6. I have read in other posts that the Idle Control valve may be to blame. I took out the throttle body and cleaned it out thoroughly. Solved some of the problem but it will occasionally be difficult to start when cold and I drive a short trip. I plan on replacing the idle control valve in the near future. I found a temporary fix is to turn on the car and keep the idle up near 2000 rpm for about a minute (allows engine to circulate oil) and then rev up the engine to about 5000 rpm a few seconds at a time. I am then able to drive off with minimal problems.

Nov 24, 2008 | 2002 Toyota Highlander

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