Hvac problems
Thread Starter
Instructor
Joined: Sep 2000
Posts: 124
Likes: 0
From: Hortonville Wi
Hvac problems
The control flaps for the vents on my '94 coupe are not working correctly. I can't get the upper vents to work. Everything flows to the floor. Is this a common problem?
Le Mans Master
Joined: Mar 2004
Posts: 8,700
Likes: 298
From: Ft. Lauderdale Fl
Take a look or purchase a FSM (factory service manual). Sounds like HVAC module. The rubber hoses going to it have deteriorated. Simple job but tough getting to it.
Its a common problem.
Its a common problem.
Le Mans Master
Joined: Jul 2001
Posts: 8,183
Likes: 3
From: Santa Maria, CA
Check under the passenger side fuel-rail cover.
There is a vacuum check valve there that deteriorates and leaks the vacuum.
Check the lines also for brittleness/cracks.
There is a vacuum check valve there that deteriorates and leaks the vacuum.
Check the lines also for brittleness/cracks.
Last edited by pablocruise; Mar 13, 2008 at 09:24 PM. Reason: spelling
Instructor
Joined: Oct 2007
Posts: 151
Likes: 1
If your cruise control works, It's not the check valve. The most common problem for what you are describing is usually the vacuum module. The connector to the module needs to be replaced or eliminated.
Do a search. you will find the procedure for removing the Vacuum control module and the repair. I did mine with the help of the forum. It's not huge project.
Good luck
Do a search. you will find the procedure for removing the Vacuum control module and the repair. I did mine with the help of the forum. It's not huge project.
Good luck
