What Is Rear Window Defroster?

What Is Rear Window Defroster? A defogger, demister, or defroster is a system to clear condensation and thaw frost from the windshield, backglass, or side windows of a motor vehicle. The rear window defroster was invented by German automobile engineer Heinz Kunert. How does the rear window defroster work? Those lines are the rear windshield’s

Why Does My AC Switch To Defrost When I Accelerate?

Why Does My AC Switch To Defrost When I Accelerate? The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops. There is also a revised vacuum check valve available to address this concern.