Passat (B5) :: Aux Fan Runs Constantly With Key In


Jun 20, 2008

2000 1.8t ATW/AEB auto. We completed the motor swap and the car ran/runs perfectly. Everything functions but just outta the blue the aux fan decides to run when the key is on the on position. And no the A/C is not turned on.

Pulling relay 214 does nothing! It still runs. Pulling ALL relays does not do anything...it still runs. It has constant voltage to it while the key is on. The car runs perfect otherwise but the aux fan is incredibly loud and makes the driving experience suck.

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The performance of the battery doesn't seem be degraded, but it seems like the battery is hopping more between charging cycle or whatever you would call it , where you watch the instantaneous MPG on the highway drop down for 10 seconds to 40-50, then back up to 60-70.

The car is a 2011 Prius III. It did not run like this earlier in the summer in the same weather conditions, I would hear the fan maybe once every few weeks in hot 90 degree weather. Now I hear it constantly. This is my first summer owning the Prius so this may be normal, but I wanted to double check with you all if this is a sign of premature traction battery death or something.

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I bought a 1999 1.8T Passat B5 about 10 months ago. The BRAKE and the ABS lights both were constantly on. The car also beeped at me everytime I turned it on. Obviously, the ABS control module was bad. Then, I bought an used ABS control module online, replaced it and the BRAKE light went off and the beeping stopped as well. The ABS light still stayed on.

Next I had the car scanned (VAGCOM). Below is what it reads. Both right front and rear ABS sensors were bad. I replaced them. The ABS light still stays on. I am wondering what this means:

18258 - Powertrain Data Bus: Missing Message from ECU
P1850 - 35-00 -

Is the replaced ABS control module still non functional?

Should I have the car scanned again and reset the light since I replaced both faulty wheel sensors? Is it obvious that the ABS control module still needs to be rebuilt?

VCDS Version: Release 10.6.4
Data version: 20110418

Tuesday,07,June,2011,18:29:06:63737

Chassis Type: 3B - VW Passat B5
Scan: 01 02 03 08 15 16 17 19 35 36 37 46 47 55 56 57 58 75 76 77

[Code] ....

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