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OK folks! How about this one? Our 2000 Buick Park Ave has some interesting stuff going on: During the summer, we only got cool A/C air on the passenger side (driver side was always hot). Now that winter’s here, we only get heat on the passenger side. So far my investigation seems to be leaning towards a motorized door actuator on the side of the evap box. I never realized that there’s no valve to control coolant flow through the heater core! As far as I can tell, it’s only this door that controls hot/cold air. I wonder if anyone has any thoughts on this please?
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It definitely sounds like you are going in the right direction…is the actuator easy to get to or is it like you have to rip the entire dash off just to get a look at it?
If it has dual zone climate control an actuator is a definite possibility.
The real question is if you can get to it without tearing the whole dash out.
If the suspected bad actuator is beside another, you can probably switch connectors and check function using that control.
Thanks guys! Yes, I can get to it after removing the under-dash panels. I didn’t think about swapping another motor. I’ll give that a try before buying a replacement. If that doesn’t do it, well, I don’t know… then I’ll have to figure out what drives the flap control motor. More to follow…
One other thing…when you remove the actuator use your finger or a screwdriver or whatever works to manually move the blend door position. First it will tell you whether or not the door is jammed and second it will tell you if proper placement of the blend door will fix your problem (one you move it into position turn on the HVAC and see what results you get).
Also with the actuator still plugged in and it’s shaft partially removed you may be able to watch it in action to see if it has stripped gears and if it’s capable of a full range of motion.
Good point JayMann! Weather’s knida crummy here in NJ so as soon as I can make room in the garage I’ll give that a try as well…
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