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Hey gang-
A while back, I posted an issue in part of a really old thread which wasn't getting much attention anymore. A couple days ago, one of our other members e-mailed me that he was having similar issues, so I figured I'd post the conversation to see if anybody else was having the same problem, and hopefully, to see if anybody has some insight.
My problem was that the ACC blower motor was blowing very low.
Me:
I was just doing a search on this topic since my 2002 9-5 Aero has (had) the same symptoms. The max speed on the fan was very, very low. Last summer in Phoenix, Arizona was pretty rough.
Figuring I'd get nowhere, I went ahead and pulled the fuse. Fuses are either on or off, right? I turned the key to the On position (but didn't start the car) and turned up the fan all the way. I could hear the faint whir of the fan and the slightest puff of air coming out of the vent. I pulled fuse 22 (40 amp) and examined it. When I pulled the fuse, of course the fan turned off. The fuse looked fine, so I put it back in. I am dumbfounded, but when I pushed the fuse back in, the fan came back on full blast!
I figure there might have been some corrosion where the fuse and socket connect that got scraped off when I pulled the fuse. Either that, or I reset some goofy little computer somewhere. Time will tell if the fix is permanent.
Update: It wasn't permanent.
John:
Read you post from March and have the same problem with my fan. I did what you did, pulling the fuse and replacing it and just like you, it worked and my fan ran like normal but it didn't last long. A couple of car starts etc later, it went back to its normal slow speed, even if on high. How is yours doing? Any more suggestions? I was thinking of putting in a higher fuse like maybe a 50 amp? Here is your post from March to refresh you memory. Thanks for anything - John
Me:
I found the same thing you did. After pulling the fuse, the fan runs higher for a while, but eventually slows down. I still have no idea why it works. Here are a few thoughts:
I think we've eliminated the dirty fuse hypothesis.
The fuse or wiring heats up when the fan runs, increasing resistance. A bigger fuse might help this, but I'd think we'd see the fan run full blast when we first start our cars, then gradually slow down.
Some computer somewhere gets "confused" and sends the wrong signal for a slower fan speed than is called for. Pulling the fuse resets the computer, maybe? I'll get out my meter to see if the fuse in question stays energized when the car is off. If so, maybe some sort of relay to kill the power to the blower when the car is off might help?
This type of stuff isn't necessarily new to me... I've build my own circuits since I was a (geeky) kid, I understand impedance and capacitance and those sorts of ideas. I have to admit, I'm completely stumped. The fact that the problem comes back fairly quickly (within a day or so) just makes it more confusing.
After just living with it, you've got me re-interested in solving this problem. I would love to pull the blower motor and speed controller, but after checking WIS, it looks like a significant undertaking.
posted by 67.50.2...
, Wed, 19 Jun 2013 21:13:17
, Thu, 11 Oct 2012 13:22:47
, Thu, 11 Oct 2012 11:57:57
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