My AC is at times just slightly cool but then it blows hot as hell. I live in Florida and that not good.
SOURCE: AC is blowing out HOT air... How to get to the Blend Door to check it?
No, you just need to fill freon gas.
SOURCE: Blows hot all the time.
I fixed the problem. It was the blend door actuator, but the wheels continued to turn because the reset operation requires resistance to know when the blend door is at its limit for the hot and cold side. At least that is what I assume. If the actuator is tested off of the blend door, it will simply turn until it can't turn anymore. After installation, it worked fine.
SOURCE: 2000 Chevy Silverado 1500 The heater does not
Had the same thing happen to my truck, the blen door actuator is under the console on passenger side, but the heater core is going to be clogged if you dont have any heat coming through, but a/c works..
SOURCE: My 01 chevy venture blend door acuator is not working.
Your blend door in the Venture is on the driver side of the van, under the dash just above your right knee at the side of your plenum. You will see a white arm that will move to adjust the blend door. The blend door actuator sits on top of the plenum held down with 3 screws. If you did not want to diagnose the problem you could just wire it in place for summer or winter. Personally I would try and diagnose the problem. Hope this helps.
SOURCE: 98 Jimmy Blend door cycling
I have the Heater/blend door to replace the old one in my 98 gmc jimmy. I cant get the part to slide on the shaft. Any ideas?
Air
Temperature Control Blend Door Failure No Heat or no AC (dependes on
where door sticks)
In
all modern cars there is a tiny DC electric motor driven gear drive
that moves a plastic door that blends heated and cooled air from the
AC and the heater core, this is called (interestedly enough) the air
temperature control blend door actuator. The motor that moves this
door fails because the door starts sticking from warping, most common
complaint is no heat but it can be no AC as well. To replace these
parts (blend door and blend door actuator) you must remove the entire
dash from the car. Always have this problem confirmed by a dealer or
qualified repair shop as it is a very expensive repair.
Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.
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