Dan or Bill, do we have a thread covering HVAC issues on the 2000+ plus Bonneville? My A/C is blowing cold out of the passenger vents, but hot out of the middle vents and the driver'* vents. Its probably a mix door, but I was hoping we had a write up on it so I don't have to tear everything apart.

I found the thread I was thinking about, but it is for 96 - 2000:

https://www.gmforum.com/mechanical-134/default-redirect-cooled-air-late-model-gm-cars-96-2000-a-279092/

Are there any other write ups?

So, reading a few more threads, I am coming up with one of two possible causes. Low refrigerant or malfunctioning mix actuator motors. If that is the case, I can watch the actuators (dual zone, so one acuator on each side) to see if they are moving. If they don't move, replace the actuator. If they move, charge the refrigerant.

Does anyone know what I have to remove and where to look to see the driver and passenger mix control actuators on a 2001 Bonneville?

If you were low on refrigerant then none of the vents would blow cold. You have a issue with a air mix actuator. If I remember right, sometimes the plastic gear strips out and the motor will move, but the lever will not.

Yep, I think Todd was our HVAC guy till he went crazy. = P

I remember that being the cause as well.

This is a old thread, but with Roy being a active gearhead, and summer coming, I am going to ask Roy to follow up on the fix...

Roy, TIA