Heater not working
SOURCE: Blend door not working.
The bleed door controls air temp not where it comes out, dash, floor, defroster, this is most likely a mode control switch problem, that switch is on the ac control head.
SOURCE: How to change heater blend doors on 2003 Jeep Grand Cherokee
go to wjjeeps.com there is several pictures and step by step instructions.
SOURCE: Blend Door on 98 Ford Explorer
the blend door is roughly in the middle of air distribution Plenum assembly between the heater core and the AC evap core, it either directs air through the heater core or the AC evap core or mixes air from both.
SOURCE: Pontiac G6 2006 heater won't heat!
If you are somewhat mechanically inclined, here is an easy way to see if your heater core is actually plugged or not. It does require that the engine is up to operating temperature, which means you should also be careful not to get burned.
Find where the heater hoses actually pass into the car. They are usually found going into the car behind the engine at the firewall. There should be two black rubber hoses, about 5/8" diameter. With the engine running at operating temperature and the heater on, both hoses should feel pretty hot. If one hose is hot and the other feels cold or lukewarm, the heater core is most likely plugged.
SOURCE: Need to find and fix blend door on 2001 Audi A4 Quattro 2.8L
you would have to remove the dash. i would first check the auxilary water pump to make sure it's not leaking. if your car has electronic climate control turn the heat on low with the engine off the change the temperature and listen for an electric motor sound to see if the blend motor is working.
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