Sign in | Register | My account |

AC is stuck on defrost and floor which is default. What needs to be done to get the air blowing thru vents?

George Shapleton

Asked by George Apr 12, 2013 at 03:48 PM about the 2009 Mercury Grand Marquis

Question type: Maintenance & Repair

3 Answers


I found a similar problem in our database. It seems like the Ford products have a module that can fail. GM products use vacuum tube which fail. You can't win sometimes.


It most likely has a vacuum leak. Only a few times have i seen the control head go bad. you need to take the control head out and see if you have vacuum to it. and if not track down the broken hose

1 out of 1 people think this is helpful.
You think this is helpful.
Tom Demyan

The guys are right, a vacuum hose has popped off or cracked.

1 out of 1 people think this is helpful.

Your Answer

Related Questions

Grand Marquis
Looking for a Used Grand Marquis in your area?
CarGurus has 3,089 nationwide Grand Marquis listings starting at $1,200.

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 950
#2 kbro
Reputation 930
#3 Tom Demyan
Tom Demyan
Reputation 310
View All