HVAC Mode/Temperature Door Actuators May Fail on Pontiac Bonneville

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

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Average mileage: 136,488 (10,000–267,000)
10 model years affected: 1993, 1996, 1997, 1998, more1999, 2000, 2001, 2002, 2003, 2005
61 people reported this problem
30 people shared problem details
warm air on driver side and cold on passanger
25 people like thisFlag inappropiate
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.
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hot air rt side cold air left side
12 people like thisFlag inappropiate
hot air on driver side and cool air on passenger side how can this be fixed
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My controls are stuck in the defrost/floor mode.
10 people like thisFlag inappropiate
HEATER NOT SWITCHING OVER TO BLOW HOT AIR BLOWS COLD AIR ON FLOOR.
8 people like thisFlag inappropiate
Air flow out Dash and floor only. Looking for a fix! I have not fixed it yet and was wondering where to start.
5 people like thisFlag inappropiate
Hot air on the driver side, cold on the passenger side.
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ac works good the problem is that air come on downside only. what causes it?
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driver side warm pass side cool ,not repaired
2 people like thisFlag inappropiate
05 Bonneville blowing cold outa pass side n heat on left side
Air only blows out defrost and floor vents. Cannot run A/C the vents only blowing from those locations. A/C worked fine before this happened, when I could manually change from dash to floor to defrost, etc.. I was told that the blend door actuator is likely what has failed and is causing this problem. Hoping to find a do-it- yourself fix.
It isn't fixed yet. I took it to sears and they told me it was the temperature blend door actuator was either stuck or broken but they couldn't fix it
air cond air flow the same in recirculate mode
No air through vents only defrost and floor
AC/heat only coming from defrost and floor vents, despite what mode is used.
First AC blowing hot air on drivers side then a couple Months later also passenger side. No ac at all now.
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
Driver's side air flow intermittent, both a/c and heat. Coolant leaks out somewhere... not obvious to mechanic.
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