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Discussion Starter · #1 ·
After I bought my Saab (1994 NG900 S) the heater/fan control wasn't working properly, and when I had the car serviced they took the panel off and fixed up the heater - I also had the AC regassed (they said the compresser was fine)

Now that the weather is warming up I've turned on the aircon... and found it behaves exactly the same as the heater; with the dial all the way in the blue air comes straight in from the outside, and if I turn it up at all it blows hot. I can notice a slight change in engine tone and idle RPMs when I hit the switch, but whatever it is doing seems to have no effect on the air blowing out.

Could this be something simple like bad wiring on the back of the control panel, or are there other places I should be looking at to determine what is going on?
 

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Dr. S,

I recently had this promblem with my 01 9-5. It may be a similar issue with the 900. There are several small electric motors which control the linkages for the flaps, doors, vents, etc. Mine were on the passenger side of the center console. I removed the glove box and some of the carpet covering the area and was able to see the control rods and motors. If you can do this, look for a rod that you can move with your hand with the system off. If you can move one back and forth it means the gear in the motor is not engaged with the gear in the linkage mechanism. You can also try to observe the operation of everything while you manipulate the temperature settings to look for one that does not move. In either case, you should be able to see if a motor/rod assembly is not working properly. If you find this, remove the motor and observe the fit of the gear on the shaft, with the larger reduction gear. Often the shaft moves out from the motor and will no longer engage. If so, TAP the gear back into the motor until you get proper alignment of the gears. If you go too far, tap back from the other end. Reassemble and try it!

Good luck, hope this helps.

You can see a lot more on this topic in the 9-5 forum FAQ. Scroll down to the code 08 topic and sit back and digest it!
 
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