Well I have just managed to exchange the cabin fan unit on my 9000 Aero MY97. A pig ( :x ) of a thing to replace and took me considerable time (and patience). Fired up the beast for a test run (btw, I replaced it with a second hand unit from a non-ACC 9000with low miles). Previously my fan had been suffering from progressive bearing noise to a recent situation where the fan would run intermittantly and vary depending on car movement (suggesting worn brushes on motor). Anyway, exchanged with the newer unit and did a test run. Seemed to be ok but then noticed irregular fan speeds. Also with Air con on and set to LO setting, fan speed did not seem to be as strong as it should have been. Some questions:
1. Could be the replacement blower unit also has a problem (????)
2. Could be fan speed regulator/controlled
3. Could be tempereature sensor (unlikely)
Can anyone advise likely hood of fan speed controller being flakey.
Well finally solved the problem. It was the fan speed control unit (resister) that was playing up. Having said that, I felt reasonabley confident that the second hand (low mileage, non ACC) blower unit was ok. Now back to stable and confident cabin fan speeds Someone on another forum had insicated that whr fan speed control unit can become faulty when you have a failing blower unit. Not sure if anyone else has any views on this???
BTW, I'm not too dissapointed about the blower unit replacement since the original unit was exhibiting some bearing noise (canary in the car ) and was probably on it's way out.
After doing a search to find more about what might wrong the 9K's cabin fan speed being random, I found Tony's post and pm'd him. He pointed me in the right direction.
My cabin fan would just huff and puff, with random speed changes.
It turned out to be the Cabin fan motor control, located exactly as Tony says.
If you pop the top off the unit, you will see the underside of the pcb. An arched hole gives you access to the screw retaining what seems to a transitor to the back of the heat sink. Remove that and the pcb retaining screw and you have the controler out.
Found two bad condensers and a dry joint on the board. $1.09 in parts (not including labour)..... got the problem fixed. :cheesy:
Two, tiny bloody condensers grrrr.
hi cuba & smsaero
as you are probably aware there is a resister controller in the engine bay for controlling the fan speeds.this has a transistor which does blow in a reasonably unuseful fashion-becomes garbage and totally useless!!!!!the controller circuit board can be gently/carefully removed and this transistor replaced.it is part number#2SD1525-made by toshiba and is ONLY used in saabs.it is approx $aud16.try newark inone or farnell inone( the farnell inone p/no#465-9223),if not no idea where you would purchase this in the states.cheers.
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