Question about 2003 Chevrolet TrailBlazer

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Interior temperature control not working. Heat is on full when A/C is on.

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If you have replaced the stereo at anytime , i would pull the stereo out and look right behind the stereo and there is a black control unit with wires hooked to it , make shure these wires have not been bumped by the new radio. make shure it is pluged up good, this controls the damper that seperates the hot and cold .

Posted on Oct 07, 2010

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Posted on Jan 02, 2017

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1 Answer

When temperature control is set to AUTO, why does it alternate between heat and A/C?


That's the way the system was designed to work. The interior temperature display should vary only a few degrees around the set temperature. Greater variation may indicate a control problem.

Feb 01, 2016 | 2006 Lincoln LS V8

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1999 ford expedition , runs good doesn't overheat , but puts out no heat ?


heater core might need replaced . check the hoses going to it under the hood after it gets to operating temperature .One should be hot and the other not so much

Nov 19, 2015 | Ford Cars & Trucks

1 Answer

I replaced the heat blend actuator because I was not getting any heat. Now, after replacing, all I get is hot air and no cold. The A/C was working fine just before replacing.


Do you have Manual Climate Control System or Dual Automatic Temperature Control System ?
The temperature control switch:
  • is a potentiometer that outputs a variable voltage to the temperature blend door actuator to set the position of the temperature blend door.
  • initiates closing of the heater control valve. When set to full COOL, a lever on the temperature blend door pivot shaft depresses the pintle of the heater control valve vacuum switch. The heater control valve vacuum switch then applies vacuum to the heater control valve, closing off engine coolant flow to the heater core.
  • is serviced only with the climate control assembly.
You may have disturbed something when changing the actuator , the vacuum switch o vacuum hose .

Oct 21, 2015 | 2005 Ford Explorer XLT

1 Answer

No heat just a/c


Low coolant level in engine will result in no coolant reaching interior heat exchanger. Otherwise, check environmental controls. Feel heater hoses under hood to see if they get warm when engine is warm. Could be control valve is not being opened to allow hot coolant into interior heat exchanger.

Feb 22, 2014 | 2000 Buick LeSabre

1 Answer

Chrysler lhs climate control


climate control requires the ac to work as well to vary the heat temperature and remove humidity from the cabin air. Check that the ac is working .

Dec 14, 2013 | Cars & Trucks

1 Answer

Don't know much about my Lexus Ls 400-1993. Need to put on heater but, can't figure out how


it has climate control which is controlled via the climate control panel. This will keep the car interior at a constant temperature rather than blast heat at you.

Oct 25, 2013 | Cars & Trucks

3 Answers

Heat- Is parking a car in high sun temperatures


heat is not fun during any time, is it harmful, yes and no. it can cause your Ac to work harder to cool the vehicle down in addition to eventually fading your interior. a suggestion to the heat would be to have light or white paint for the exterior (probably to late for you on this) and some type of window tint to reduce the heat on the interior. my vehicle hits about 110-120 degrees interior temp during the summer month's. 4 hours a day is not to bad for the sun exposure. I hope this helps!

Sep 24, 2009 | 2003 Kia Rio

1 Answer

2002 Land Rover ~ Freelander - No heat coming from the heater


Look for two water lines about 1 in in diameter running back toward the condensor unit in the firewall. On one of those lines will be a control. It is sometimes vacum controlled. When they are vacum conrolled they have a tendency to get stuck or you may have lost vacum to the unit. You can use a vacum tester and short piece of hose to test this to see if you have lost vacum or if it is stuck closed. Connect the test hose to the control on teh hose and apply vacum to the unit. If the valve opens you will get heat in the vehicle. If it does not open then it is stuck in the closed position and will need to be replaced in most cases.

Sep 10, 2009 | 2002 Land Rover Freelander

2 Answers

All i get from my heater is heat i cant turn the ac on, and when i turn off the heater it still blows hot air


Sounds like a stuck heater core valve. Find heater core valve. Under hood, find the two heater core hoses going into firewall. One of the hoses has a valve. Operate temperature control (full heat, then full cold) check that valve changes position. If not either replace valve or control system failure. Also, when temperature control in cold position, one hose should feel hot and the other cold. Temp fix: disable valve to close no heat or on heat.

Jul 10, 2009 | 1998 Dodge Ram 1500 4WD

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