WHEN THE TRUCK IS WARM THE HEATER IN THE BACK WILL BLOW HOT AIR OUT OF THE PANELS OR FLOOR BUT IT ONLY BLOWS COLD AIR UP FRONT, ALSO WHEN PUSHING THE FRONT BUTTON TO PUT THE HEATER ON THE FLOOR IT WILL BLOW OUT OF THE DEFROSTER, WHAT MAY BE GOING ON AND IS IT AN EASY FIX?
Your controls have problems. the heat is there it is just not getting out because your control lines are not setting the vent controls into the proper positions. i had a chev van that lost some of the foam in side there and it blocked the whole front off. i had to rip it all apart to get at it
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www.tahoeforum.com > ... > Technical Discussions Dec 5, 2008 - 10 posts - ‎7 authors
2001 Tahoe, the front heater blows a little hot air when the car warms up and then blows cold air. The rear heat seems to work fine. I changed ...
Jul 14, 2008 - 10 posts - ‎5 authors
On my wifes 03' Yukon the rear air conditioning blows hot air no .... Pull the panel off and look at the hot/cold actuator shown in the picture.
there"s no switch, but there is a blend door motor that is known for problems that controls the amount of cold or hot air output from the rear heater ac unit. repairing requires removal of the left rear inner body trim panel trim for access . let me know if you have any other questions.Thanks for using fixya
always check the coolant first, then feel both heater hoses to see if they are equally hot.
if one hot and one cold, then the heater core is clogged
if both hot then you have a blend door problem.
on the a/c there's some time a rear unit that blow cool air even the front does not
Buy used parts at car-part.com. Look on page with * to find the cheapest part. Coud be your temp blend door (#2) may not be moving back and forth. Or, you are not getting hot water to the rear heater core.
You may have to crawl under the truck and feel the heater hoses to see if they are hot. You will find a group of 4 lines, 2 for heater and 2 for a/c. If hot, you know hot water is getting back to the heater core. If not, there may be a hot water vave that's not working. Not sure if EXP. has a water valve for rear.
the blendoor on the heater box maybe broken ck lines going to heater core and make sure they are hot. does the heat temp change at all from cold to hot?
You either have a bad control, or motor running the air direction door in the front HVAC unit, or a door that is stuck.
The front and rear units are totally separate.
The door directs where the air, cold or hot, should come out, whether it is panel vents, floor, defrost, or any combination of those.
This door and motor are located inside the heater box which usually requires a lot of the vehicle dash assembly to be taken apart to get to these parts.
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