Question about 2004 Toyota Highlander

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2004 Toyota Highlander Problem a/c heat

The a/c blows heat all the time, heat is on when vent is on, small amout of heat when controls are set to off

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  • Anonymous Oct 13, 2008

    I have a similar problem. A/C will be on and runs okay, but when I switch back and forth to a cooler temperature the heat will blow for a second and then it will go back to the cold temp.

  • mbloom Dec 28, 2008

    I have a 2002 Highlander. Occassionally I can't turn the heat off even with the fan off and the thermostat dashboard dial on cold. Sometimes it goes on and off intermittently. So far it responds to fiddling with the thermostat dial on the dashboard. I turn the dial all the way up and down a few times and sometimes the heat goes off. I have been known to take off the dial and spray with WD40. So far, I can usually get it to stop blowing heat when I want to. One day I may not be so lucky. Any known problems or fixes out there?

  • ddc2525
    ddc2525 Sep 02, 2012

    This is a easy fix if you are a little mechanically inclined...This guy has detailed step by step instructions on how to fix the problem. You will need a few simple tools ( phillips screw driver, falt head screw driver, 10mm socket , adjustable wrench and a little soldering skills ) Here is the link. If you live in California in the south bay and you cant do this yourelf i will help you for a small fee. Email me at ddc2525 Good Luck



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The thermostat is broken.

Posted on Aug 30, 2008


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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.

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My 2004 toyota highlander a/c blows cold air and also hot air. Do you know what causes this and how much it will cost me to fix it?

Yes, I know the answer. The wires on the heat control knob have come loose from the main circuit board. It is a ERY expensive part to replace. However, you can repair it, if you, or somebody you know, can solder wires. You will need to remove the AC amplifier assembly, and disassemble it. it is apart, you will se 1 or 2 broken wires on the control knob circuit board that connects to the main board. Resolder them, and you are good to go.

Jun 11, 2009 | 2004 Toyota Highlander

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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.

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Vents only blow on HIGH on 2004 Highlander

You need to replace the heater blower motor resistor. It is located in the air tube between the motor and the center of the heater box, under the glovebox area.

Apr 20, 2009 | 2004 Toyota Highlander

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When we turn on the air on the 2003 toyota highlander it does not blow out the vents is there a control to divert the air to other ducts ??? is there a way to troubleshoot it is it vacuum controlled or a...

The temp control knob in the middle gets loose and actually breaks off causing your problem. You used to have to get the whole controller from toyota.. not cheap. good luck

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Try an A/C recharge. What is the temps of the discharge air from the vents?

Dec 27, 2008 | 2004 Toyota Highlander

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