Question about 2001 Toyota Highlander

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Temperature control knobI have 2001 Toyota Highlander. My heater won't work in winter. I can get heat when I turn sensitive to temperature control knob but stops working - very intermittent. Same thing happens with air conditioner. When AC is turn on, I sometime get heat... AC is also sensitive to temperature control knob. Is this problem with electronics in temperature control knob?

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Posted on Jan 02, 2017

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SOURCE: 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.

Posted on Apr 23, 2009

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How do I disconnect heater for 2004 Toyota Highlander?


bypass the heater core. 2 small hoses run from the firewall to different locations on the engine (one should be the thermostat housing. dissconnect one hose from fire wall end, and reconnect it to where the opposite end of the other hose is located, creating a loop that does not include the heater core. The remaining hose (one end still attached to the heater core at the fire wall) should be connected to the opposite connection at the fire wall so it can be re-engaged next winter.

Actual problem seems to be the heat damper valve, which restricts water flow into the heater core, easiest fix is reattach the actuating cable to the valve arm (if this was detached) most costly is replace valve assemble/heater core assembly....

Oct 04, 2014 | 2004 Toyota Highlander

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


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

I have a Toyota Highlander 2001 When i turn the heater on the red it will blow cold air?


have any coolant leak repaired lately?sometimes it is very hard to get the air trapped in the cooling system out.also there is something called a air blend door motor/valve under the dash.if you move the control from cold to hot you should hear something moving under the dash.

Oct 07, 2012 | 2001 Toyota Highlander 3.0

1 Answer

TOYOTA HIGHLANDER A/C CLIMATE CONTROL NOT FUNCTIONING


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

1 Answer

Is it possible that with a battery that is loosing its charge that it could affect the heat? It is a 2005 Highlander. Thanks!


No, the battery has nothin to do with heat inside the cab. The heater works from the hot water in the engine (actually a mixture of water and antifreeze) This coolant mixture runs thurogh the engine to keep it around 190 degrees. It also runs through a small radiator (called a heater core) under the dash. there is a fan that blows air acroos the heater core and viola' heat in the car. Can you believe this used to be an option! Anyway, you bateery has nothin to do with heat. In the winter, a stuck open thermostat can cause you to have no heat in the car.

Jan 18, 2011 | 2005 Toyota Highlander

1 Answer

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

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.
Mark

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

1 Answer

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

3 Answers

Heater does not work and check engine light is on


Please see
http://www.tundrasolutions.com/forums/highlander/32217-heater-quit-sort-of/
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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