HVAC Mode/Temperature Door Actuators May Fail on Pontiac Bonneville

Problem Description and Possible Solution

The mode and temperature door actuators may fail causing improper air flow or temperature output from the heating and AC (HVAC) system.

Problem Data
RepairPal Verified
Average mileage: 141,854 (10,000–267,000)
10 model years affected: 1993, 1996, 1997, 1998, more1999, 2000, 2001, 2002, 2003, 2005
110 people reported this problem
Viewing 1 - 20 of 48 comments
Will only direct air out of defrost and floor, not the front vents unless driving for a long time, and then only a minimal amount comes through. Once the car is parked, it vents through the defrost and heater again.

Inspected vacuum pots under dash, couldn't find leak. Verified that engine vacuum was present. There is a control module that 6 small, multicolored lines connect to under the passenger side. This is where the automatic climate control designates which line has vacuum to actuate the controls for delivery. I wasn't able to do anything with it however. Still researching the issue.
Air blows cold on passenger side and hot on drivers side. Can this be temp blend door actuator or is it the drivers side actuator? Where are they and how do you replace the drivers side?
Air flow out Dash and floor only. Looking for a fix! I have not fixed it yet and was wondering where to start.
My air won't blow cold and. Only blows out floor vents defrost vents and rear vents in the back seat have not fix yet still don't know what to do
Well it's blowing cold air but if I feel where the heater core is it's hot so I don't no y it doesn't push hot air out the vents
The blower motor was replaced due to vibration and squealing. Prior to this I couldn't get any volume of air to come out in any setting. After changing the motor I can hear the motor changing speeds but still no air coming out. Compressor cycles and heater control switch seems to shift.
I have to ruin the air on max because the other fan settings doesn't work at all. I think it should also blow harder.