Haeter A/C Vents 91 940 SE

gyrene · Post by **gyrene** » 09 Jul 2007, 13:24

My 91 940 SE Wagon has a problem with A/C vents. They will not open all the way like they are suppose to. Is there a vacuum switch or relay that has gone bad? The A/C, works fine its real cold but the air cannot blow through the vents. Help someone!!!

Kmaniac in California USA · Post by **Kmaniac in California USA** » 09 Jul 2007, 14:54

The vent positions are vacuum controlled. How about heat? Can you vary the heat with the temperature control slider?!?

Go to the auto parts store and buy a hand-held vacuum pump. Disconnect the vacuum line to the vacuum sourse hose on the engine, attach to pump to the control line and see if you can draw and hold a vacuum on the controls. If so, the problem is most likely in the vacuum hoses from the engine or the vacuum reservoir tank. If not, you may have a leak in one or more of the control bellows under the dash.

Check it out and let us know what you find.

I had a similar problem I posted three years ago with my 1986 740. Search the posts for my story.