On my 2010 Mercury Grand Marques on a/c the air rotates from vent to defrost to floor. Does anyone know what went bad?

10

Asked by Sep 13, 2015 at 09:12 AM about the 2010 Mercury Grand Marquis LS

Question type: Maintenance & Repair

3 Answers

72,395

Sounds like the inline vacuum check valve. If this happens when you accelerate, it's definitely the check valve. HTH. -Jim

1 of 1 people found this helpful.
10

I need to have it checked out, thanks for the help

1 of 1 people found this helpful.
72,395

You're welcome. Glad to help. -Jim

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