Heat settings

Asked by Cardummies Jan 30, 2019 at 11:50 AM about the 2017 Buick LaCrosse Preferred FWD

Question type: Maintenance & Repair

Why do my windows only  fog up when I turn my
heat on the floor or vent setting?  The only way
they stay clear are on the defrost setting.

2 Answers
22,215

Gary answered 5 years ago

That is what it is designed to do. Generally, windows fog up when you have high humidity inside the car. When you turn on the defroster, it actually uses the A/C compressor to lower the humidity. You can try turning on the A/C when using the vents (yes you can use the A/C and heat), this should reduce the window fogging.

2 people found this helpful.
Mark helpful
43,910

Hornet_2497 answered 5 years ago

Gary explained it very well. I might add that your floor mats can be a big source of moisture this time of year if you live where it snows a lot. I dump the slush off my floor mats every night when I get home. Wet clothes can add moisture too.

Mark helpful

Your Answer:

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