Air conditioner

Asked by GuruJVNT May 24, 2017 at 01:15 PM about the 2007 Mercury Grand Marquis

Question type: General

When I turn on the air conditioner the air only comes out of the defrost vent
not the vents on the dash  the way it used to so as a result it does not work
very good. Is there a relay that changes the air flow? Thanks Darwin

3 Answers
115

Henry answered 7 years ago

Heat-A/C vent controls are vacuum controlled, so you have a cracked vacuum line, or pinched hose in dash. If you're handy take glovebox out, and then start car (have a flashlight handy) to see what's not moving correctly.

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110

GuruZ5LGZ answered 7 years ago

If your heater control is digital it may need to be replaced. Air coming out of the defrost and or floor vent is typical of a bad control module.

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GuruT3QKW answered 6 years ago

Had the same problem. Bought a rebuilt ac controller from Automotive Scientific. Works perfect. Fix the problem immediately and its a fifteen minute swap. Don’t mess with the core as its another $50 bucks if the core is unusable. If the problem is in the vacuum controlled controller under the dash or in the interior flap itself, it is a major replacement problem. Entire dash has to be removed to get at it properly. Not a cheap date.

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