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Car Forum / Saab Cars / June 2005Heater Blower Fan Motor on constantly
Hi all Please can I delve into the community chest of experience & wisdom.... Today, for no apparent reason, the blower on my 1999 93SE T decided to stay on when I switched off. Thinking it would stop when it was ready, I went off to work, and returned to a flat battery. Yay! Having got the car home after a jump start and removing fuse C (30A), I'm now starting my investigations. Several points: I've removed the ACC control unit completely from the car, and the problem still persists. Does this eliminate the ACC unit? I've run diagnostics and it does not report a problem. I read in my ancient Mitchell Auto-Repair CD manual thing that there is such a beastie as the Fan Blower Motor Speed Control Unit. Sounds promising. Should I suspect this, does it often pack up and where is the little bugger hiding? And is it likely to cost me loads of Sterling? Or any other clues. I know you guys love a challenge and the chance to impress the world with your technical knowledge... Until then I'm using old-fashioned air conditioning (opening & closing the windows!) Daniel :-)  Signature... The individuals and events portrayed in this electronic mail are fictitious, and any similarity to events or persons, living or dead, is entirely their fault. I do not own a 9-3 but this is a common problem on the 9000 where the blower fan stays at high even when ACC is off if the fan speed control went kaput. But I have never heard a case the blower keep working after the engine is off to drain the battery. On a 9000, the fan speed control is mounted on the evaporator housing behind the false bulkhead, also called the aquarium. I am sure you can easily find it on your 9-3. The heater core, blower motor, evaporator should all congregate in the same place. Update - I've managed to locate the Fan Speed Controller, attached to the heater assembly with some sort of thermal paste, presumably as a heatsink. It's showing an open circuit so I suspect this is the problem. Another on order from Neo Brothers so will update when I get this installed, if anyone cares... D :-) >I do not own a 9-3 but this is a common problem on the 9000 where the > blower fan stays at high even when ACC is off if the fan speed control [quoted text clipped - 5 lines] > easily find it on your 9-3. The heater core, blower motor, evaporator > should all congregate in the same place. I believe someone on SAABnet.com managed to fix the fan speed control by replacing a resistor or something. It is done on a 9000. But they should be the same. If you you are electronically inclined, it maybe worth a try. This sucker is expensive. >I believe someone on SAABnet.com managed to fix the fan speed control > by replacing a resistor or something. It is done on a 9000. But they > should be the same. If you you are electronically inclined, it maybe > worth a try. This sucker is expensive. I posted that info a while back. IIRC, the part is a Toshiba SD1525. Cost: about US$ 10. Unfortunately, I don't have a source for this part anymore. Walt Kienzle 1991 9000T Also forgot to mention Townsend's site has a great write-up on diagnosing ACC. http://townsendimports.com/Web/entry/tech_doc_systems.htm In it there is a section troubleshooting the fan speed control. It pays to investigate first before plunking down $100 and change to get a new one only to find out it may not be the culprit. That's how much it costs in the US. > Also forgot to mention Townsend's site has a great write-up on > diagnosing ACC. [quoted text clipped - 5 lines] > new one only to find out it may not be the culprit. That's how much it > costs in the US. Final update - it WAS the speed controller as I suspected, a used part from a breaker was GBP40, went straight in and worked 1st time. I made the mistake of trying to drive the car without the part in place, and it behaved very strangely! No radio display, no ACC display, extremely weird sporadic indicator activity and (probably) no brake lights! Beware gaps in the data network! D I think I have a similar problem although in my case the blower is just 'dead', not on all the time. I've already replaced the motor itself so I suspect the control unit. Where exactly (which side of the heater) is the control unit? I've removed the centre console side panels and can't see a thing :( > Final update - it WAS the speed controller as I suspected, a used part from > a breaker was GBP40, went straight in and worked 1st time. [quoted text clipped - 5 lines] > > D I took out the glovebox, the side panel and a smaller black plastic cover in the footwell. This cover was about 6" square and sort of quadrant-shaped, held on by a single screw. The speed controller is behind there, attached by 2 torx screws to the side of the heater assembly. It is mounted with thermal paste to dissipate the heat it produces (I used some I had left over from a PC build). The controller is about 2" x 1½" with a 6-pin plug which connects above the unit, behind the upper air duct. I've got to go in there again at some point because I want to install an aux-in for my MP3 player, so I want to have a look at the phone wiring. If you want I'll take some pics when I do! Hope this helps Daniel >I think I have a similar problem although in my case the blower is just > 'dead', not on all the time. I've already replaced the motor itself so [quoted text clipped - 14 lines] >> >> D Found it! As you say, behind a small black panel at the back of the passenger footwell. Also solved the problem - I noticed it plugs into a connector and unplugging and replugging cured it. Actually, I also removed the glovebox a while back to fiddle with the phone wiring and I'm guessing I might have dislodged the connector at that time enough for it to eventually work loose. Anyway, many thanks! > I took out the glovebox, the side panel and a smaller black plastic cover in > the footwell. This cover was about 6" square and sort of quadrant-shaped, [quoted text clipped - 32 lines] > >> > >> D |
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