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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
no....This is the rear A/C & heater actuator blend door malf/broken. This is very common on expeditions and I encountered the same issue in my 2006 expy. This door switches from hot to cold vents, once stuck only hot air will blow. Also, is there any thumping or tapping noises from the right rear panel (this is where the rear a/c unit is)???
possible blend door actuator faulty, or a faulty blend door. This door switches from hot to cold vents. On expeditions equipped with rear AC front and rear AC have seperate actuators. Hopefully this helps!!
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.
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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