I HAVE LS THE HEAT AND A/C BLOW ONLY OUT DEFROST WHY, AND HOW DO I FIX IT.THANKS!

1998 Mercury Mystique

Tiny

Ronski

November, 30, 2011 AT 6:03 AM

It makes no differance to what setting I put it on, panel, vents, floor it just blows out defrost vent. If you will please explain why it does this, and what I have to do to fix problem. V6 1998 Mercury Mystique LS 2.5

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1 Answer

Tiny

Jacobandnickolas

November, 30, 2011 AT 6:05 AM

The vent doors are actuated by engine vacuum. Check for vac leaks under the dash and the supply hose from the engine. If you are lucky, you may hear a hissing sound with the engine running.

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