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: 139,866 (10,000–267,000)
10 model years affected: 1993, 1996, 1997, 1998, more1999, 2000, 2001, 2002, 2003, 2005
62 people reported this problem
Viewing 1 - 20 of 43 comments
hot air on driver side and cool air on passenger side how can this be fixed
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.
warm air on driver side and cold on passanger
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?
My controls are stuck in the defrost/floor mode.
Hot air on the driver side, cold on the passenger side.
Air flow out Dash and floor only. Looking for a fix! I have not fixed it yet and was wondering where to start.
hot air rt side cold air left side
Will not switch from air to heat.
Blowing cold air drivers side warm air passengers side. How do I fix the problem??
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
blows out hot air on driver side and cold out the passenger side
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.
ac works good the problem is that air come on downside only. what causes it?
driver side warm pass side cool ,not repaired
cold air out drivers side hot air out pass side with a/c on
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.
hot air rt side cold air left side
No heat and air only comes from windshield vent and feet. Vehicle will deliver hot air for about 90 seconds before switching to cold, no AC either