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Do the Drivers side and Passenger side have separate "Heat/Cold" controls?

If "No" then I'm at a lose to explain this one.

If "Yes" then it may be that the controls are malfunctioning. It may be that the control switch/rheostat may be malfunctioning and need to be replaced or that the thermistor (the electronic device used to detect the temperature) on one side or the other is malfunctioning. etc. etc...........


I have a 1995 Buick Regal Custom Sedan, and just today I fixed a similar problem with my heater. Hot air would come out the passenger side vents, and cold air would come out the driver side vents and the rear seat vents under the seats. I found the problem was a connection to the electronically controlled ventilation door was not connected. If this is the case, you may want to check those. The heater core will not heat cold air that is moving at 60 miles per hour, which can cause the cabin to become quite cold. !

-Paul Musgrave

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โˆ™ 2015-07-14 15:05:37
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Q: What is wrong when your '95 Buick Regal heater-defogger vent puts out heat on the driver's side and cold air on the passenger side?
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