Quote:
Originally Posted by Paulwho
The center vent of the 190 does not have access to heated air, outside air or ac air only.
So in the winter or summer the center vent is the same as the outside air until the air conditioner is engaged.
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Yup! In the winter, just close the center vents. You'll only get cold air through them. If the sides are blistering hot, it means there's a vacuum leak...somewhere. The default is full heat whenever and wherever the vacuum system fails. Unfortunately, tracking it down isn't always easy. Begin with the vacuum connectors in the engine compartment, and go from there. Don't be too quick to replace the pushbutton unit, it's a lot of money and not usually the problem.