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VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

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Old August 21st, 2011, 16:57   #31
swacapt
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Join Date: Aug 2011
Location: Orlando, FL
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Wow! There is a second relay panel behind the primary relay panel. There are three more radiator fan relays there. Two are labeled 373 and one is 370. There is also a very large (1+ inch across) blade type 40a fuse (below and left of the 370 relay). After finding and testing the three relays, I found the fuse. Well, that was it. Apparently when the fan died, it overheated and took out this big fuse. The #25 fuse on the main cabin panel however did not blow. Looks like I might have this fixed.
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Old August 22nd, 2011, 02:00   #32
thundershorts
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glad I was able to point you in the right direction...
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Old September 21st, 2011, 11:48   #33
Quest4TDI
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Quote:
Originally Posted by Quest4TDI View Post
I'm having similar symptoms as the original poster.

AC seemed to suddenly quit working from one day to the next, based upon what my wife has described to me (I rarely drive the Passat).

1) I pulled the 384 relay, and a quick visual didn't show any obvious signs of problems. May need to pull it again and check with a magnifying glass (middle-age eyesight sucks).

2) Check for operation of the passenger-side electric fan, and it comes on with the AC on.

3) Checked the AC fuse (fuse #25 if I recall correctly) and that fuse is fine.

4) Inside temperature display is operational

Any other diagnostics I should perform before I either decide to buy a replacement relay and easter-egg it to see if it does the trick, or before I go to an AC specialist to have the whole system checked? I don't believe we've ever had the freon recharged, but the sudden change would lead me to believe that it's not the freon unless there was a catastrophic failure.

If the compressor turns out bad, it looks like I should have the following replaced:
- the compressor (Sanden or Denso) (is a Sanden-Behr compressor the same brand?)
- the drier

- is there an orifice tube to replace?
- is there an expansion valve to replace?


thanks,
Herb
384 relay bought from 1stVWparts solved the problem. AC is cold again.

Plan on inspecting my old relay with a magnifying glass to look for bad solder joints.


Herb
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