Question about 1993 Saab 900

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Hot air forced into cabin while driving 92 saab 900

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.

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  • cavcate Jun 05, 2009

    I checked the vacuum bottle on top of the front passenger side wheel well and the hoses all seemed to be intact. When I turn on the distributor switch the air flow is able to be controlled but it is still extremely hot and when turned off, there is still hot air flow while i'm driving.

  • Ryan
    Ryan May 11, 2010

    have you tried switching from vents to defrost ....

    do you have A/C on ?

    do you have the blower on or off ?

  • Anonymous Mar 14, 2014




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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.

Posted on May 30, 2009

  • saabreur
    saabreur Jul 01, 2009

    It's possible that the heater control valve isn't connected; remove the
    speaker/windshield vent cover on top of the dash behind the steering
    wheel, and you should be able to see the connecting rod between the
    dash switch and the valve itself back towards the firewall. This is more common than valve failure. If the rod is broken replace it, or if disconnected, re-connect it


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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.

Posted on Oct 08, 2009


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The good news is that there is a Haynes manual for your model which will be of immense help if you wish to save hundreds of pounds/dollars via DIY and there is an active and very useful Saab Owners' Club.

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Your hot air keeps coming since the louver get stuck due to mechanism failure inside the ducting console. It usually is controlled by temperature setting. When the setting has no effect then the engagement is loose. Nee to open the dash vent to check out.

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Driving in very hot weather, stopped at light,

you may have blown the head gasket.
check the coolant level,is it low?
if it is ok,check the fan switch on the radiator,change the thermostat,and check that the fan is working.
the fan has to work,saab engines run very hot.
there is a after run fan switch as well that measures engine compartment temperature,and can start the fan even with the car off,so be careful.

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