Having problems with your 1993 Saab 900 ?

Hot air forced into cabin while driving 92 saab 900

\015 When I drive my 1992 saab 900s, hot air is coming into the cabin through the vents but all of the air circulation switches are off. as soon as the car comes to a stop there is no hot air flowing into the cabin, it only happens when the car is in motion.\015 Posted / edited by AnonymousUser on : 06-04-2020

Answers :

The air distribution switch controls the air distribution and the fan, distribution switch in the 0 (straight down position) will be off. Car movement forces air into teh body, but with teh fan off there will be no air when the car stops. Does the fan run when the distribution switch is in any other position? it should respond to the speed settings of the fan switch.

There is a vacuum bottle accumulator that assists the distribution switch, sometimes this gets disconnected and the switch settings don't work.

Do you hear any noises if you turn the distribution knob while the car is running? suction noises, or flaps opening?

If not, then you likely have a vacuum problem (check for a white bottle in left front wheel housing, except convertible -> under the spare wheel, tank should have one or two vacuum lines connected to it (one for convertible). A disconnected or leaky line is the most likely cause.

Possible other causes are faulty air distribution switch; burned out fan motor; inoperative vacuum solenoid motors controlling air distribution flaps.

But check the vacuum accumulator first, if under the spare wheel, the lines are easily dislodged.
Unfortunately, this is a common issue for the SAAB 900. This is my 3rd one and they all did the same with the eat coming into the vents while driving. What I have done is turn the temp control to cold and that has subsided the heat a little. But, n my experience, heat tends to come into the car at the feet when all of the iar vents up top are closed. I wish I could help more. Leave the control at zero and the the temp dial on cold.
Repair Help & Product Troubleshooting for 1993 Saab 900

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