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2003 toyota highlander blower

Blower works at all speeds, but only blows cold air. Temp gauge registers heat, rad hoses are hot, but turning temp knob doesn't change temp. THIS IS NOT a loose screw problem with the knob - I've checked that. Warn out servo motor? Cracked wire from control knob to servo, or something else?

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  • 49 Answers

Try locating the physical tap that connects your heater hoses to the interior of the car. note what position that tap is in before and after you turn up the temp dial inside. whatever connects the dial to the tap may be damaged.

if the tap itself turns then the heater side of the blower may be blocked.

Posted on Feb 14, 2014

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 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.

Posted on Jun 21, 2009

  • 1403 Answers

SOURCE: I just purchased a 03 Highlander. turned on the

look to make sure coolant level is full.you may have a bad heater control module,,the knob you turned.

Posted on Aug 12, 2010

  • 3640 Answers

SOURCE: Heater does not get hot. Fan works but will only

check coolant level, if ok change thermostat, it may be sticking.

Posted on Jan 12, 2011

dttech
  • 4803 Answers

SOURCE: 2003 jeep grand cherokee heater problem

Jeep Grand Cherokee is notorious for broken blend-air doors. This is the door inside the A/C-heater housing that switches the air from hot to cold. You must remove the dash to repair it.

Posted on Nov 13, 2011

  • 560 Answers

SOURCE: 2003 impala w/dual zone ac n heat, my heat works fine and all speeds 1-5 blow just fine even with ac. but ac blows hot air. what should i do?

charge the a/c add a/c dye and ck. for leaks

Posted on Jun 18, 2012

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Need help.. I have a 2001 Dodge Ram 1/2 ton truck.. heater will not get hot.. changed the thermostat..had the radiator flushed.. checked heater coil (sp).. checked the air conditioner flapper door to see...


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This will help.Thanks.

Mar 27, 2012 | 1994 Volvo 960

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Could the thermostat cause the heater to only blow cold air even though the motor runs normal temp on a 2003 dodge caravan


1st of all, you need to check your anti-freeze level. If its not full, the coolant cannot/will not flow throughout your heater core which the coolant flow through to heat your vehicle. If it is indeed up to the proper level? Than, yes I would look into the thremostat. It may not be opening up.

Jan 13, 2012 | 2003 Dodge Caravan

1 Answer

2003 jeep grand cherokee heater problem


Jeep Grand Cherokee is notorious for broken blend-air doors. This is the door inside the A/C-heater housing that switches the air from hot to cold. You must remove the dash to repair it.

Nov 13, 2011 | 2003 Jeep Grand Cherokee

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2007 corolla does not give off heat, blows cold. temp shows correct range, heater core hoses hot to the touch inside and out, radiator hoses hot and fluid is sufficient.Would thermostat be at fault even if...


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Dec 06, 2010 | 2007 Toyota Corolla

1 Answer

It won't heat what would cause that?


ther are a couple of things that would cause this. im assuming that the blower is still working (blowing cold air) .if the blower is still working i would check the coolant level in the rad first. if the coolant level in the rad is good then i would check the thermostat. you can do this by getting the vehicle up to operating temp and checking the upper and lower rad hoses. if one hose is really hot and the other is cold or luke warm i would replace the thermostat. ( watch out for the belts when checking the hoses!)
if both hoses are the same temp the thermostat is probably good. from ther i would check the two coolant hoses that are going into the car (you should be able to see them on the passenger side of the engine compartment going through the firewall into the cab). same idea as the two rad hoses , feel the tempeture of the two hoses and if one is really hot and the other is cold or luke warm, then your heater core needs to be flushed out . any more questions just leave a message !

Dec 03, 2010 | 1998 GMC Sonoma

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

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