Question about 1987 Saab 900

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I'm having a problem with my front deroster. it seems that when it rains my windows will not clear up. If I turn the heater control knob on defroster It will not blow anything out of the vents for the defroster to work. It seems that it only blows out from the face and feet area. Do you know what the problem could be.

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The vent actuators are vacuum controlled on this model. Do you hear a hissing sound when you turn the control knob? If not, then you'll need to check the pipe or hose connections. Start with the vacuum reservoir bottle on the right hand wing just in front of the door. Ther'll be a hose from the inlet manifold to the bottle, make sure that's connected & air tight. The other pipe from the bottle goes to the heater controls. Has the radio been removed or any work done in that area? If all appears fine, remove the radio & make sure the large white, multi-hosed connector is fitted securely to the control switch & all the pipes are connected to it.
Good luck, let me know if you need any further help.

Posted on Sep 03, 2008

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