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ACC Blower won't stop!

6709 Views 4 Replies 2 Participants Last post by  Pipas
Yesterday, my '01 2.2TiD came out with an odd problem: i was driving with ACC on and i noticed that the blower was making too much noise, since it was in minimum rotation according to ACC screen; turned ACC off and on again, and the problem disappeared; later i noticed that it was again in maximum speed, although the ACC display showed minimum rotation! Turned ACC off and on again, the blower kept in max. rotation; turned the engine off, turned the car off (key retired) and the blower kept working at its max rotation!!! The only way i could stop it was by taking the 30Amp fuse off its place;
Any ideas of what could this be due to?
Thank you.

PS: my SID display needs to be replaced, as most of the characters don't appear anymore; if i have to replace also the ACC module, i think my finances are going to be messed up for some months...
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Iin some cases, all that needs to be replaced is the fan speed controller (much cheaper), which is the electronic part that regulates the fan current, not the ACC display/computer module in the instrument panel. See link.

You can also activate a self-test by pressing a couple buttons on the ACC module in the instrument panel. Someone with the same model as yours (or Owner's Manual) will have the directions.
I don't know of any self-test available for the ACC; there is a combination of butons (AUTO+OFF) that starts calibration of the ACC system... Is that what you meant or there is another combination for that sys diagnose?

Pipas said:
there is a combination of butons (AUTO+OFF) that starts calibration of the ACC system...
On the NG900, when calibration is done the display shows the number of faults found, or "0" if there are no faults during calibration and self-diagnostic.

The actual fan speed controller is a separate component, behind one of the trim panels in the passenger side foot well. On models with ACC the fan speed controller does the same job as the resistor pack on models with manual fan controls. If the controller has an internal short, it is possible that the fan will keep running on battery power even with engine and ignition off.

More detail: Battery power is connected to one terminal of the the fan motor through a fuse. The other terminal of the motor is connected to the speed control unit, and from there to chassis ground. Normally, the ACC sets the current (and therefore the speed) of the fan by sending signals to the speed controller, which acts like a switch. The ACC controller seems to be a poor design, and overheats easily. If it overheats too much, it may burn out (fan is always off), or short (fan is always on).

Article : Control unit
PartNo : 5045158
Usage : ACC
Order Quantity : 1
Let us know what you find.
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Problem fixed!!!
I justo ordered the part mentioned (P/N 5045158) at the dealer last thursday and arrived today in the morning. I put it on at the end of the afternoon and, as far as i could see, all is back to normal and the blower is working fine.
But thursday, friday and sunday the car ran without the abive mentioned part and it was all messed-up: the turn signal noise didn't sound, the dash indicators didn't flash, no interior lights, the trunk didn't close when the vehicle started running, etc. But everything is back to normal now.
Thank you all for you help: you guys rock!!! Without your help, i would probably have the car with the problem and would spend much more fixing it.


PS: next week i'm going to the dealer to program a new SID, that i negotiated with a nice discount when i ordered the A/C controller.
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