[Esel Mann]

RyderMal,

FWIW, my CCU is suffering from the same issue. The CCU ambient temperature air circulation fan runs. Which, if left running will eventually drain the battery. Early into ownership, I replaced the infamous transistor. Unfortunately that did not remedy the CCU fan problem.

Some other details:

- Every once in a great while, the CCU fan will mysteriously turn off after several minutes (10-20?) once the engine is turned off. This is like a 1 in 50 event. 49 times out of 50 the fan will keep running. Current draw for me is around 550-575mA. Note that my 964 does have an aftermarket alarm/door lock receiver which may have slightly different power requirements than say the factory alarm.

- If I do not plan on driving the next day, I simply disconnect the - cable at the battery. I have noticed most times when I reconnect the - cable at the battery, and I get in the car the CCU fan is not on. Once in a while it will however be on. This is like a 1 in 25 event with the CCU fan on and 24 out of 25 times the CCU fan is not on. This is also before I turn on the engine.


I would not recommend pulling the No. 1 fuse as a long term remedy (however it is certainly fine to do so for fault isolation and maintenance). The reason being, fuse receptacles do have a lifetime with respect to number of fuse inserts/removals. Again nothing to be worried about with the occasional insert/removal. As a long term remedy though there is a possibility of "wearing out" the receptacle. YMMV as wear is statistical in nature. Disconnecting the - battery cable is alternative to the No. 1 fuse.


My near future remedy to this is going to be to pull the CCU and send it out to have it repaired. When I do do so, I can certainly post an update as to the repair house findings and costs if you like.

My current fire is tending to the speedometer. I need the face repaired (back light shines through in a speckle pattern. It's odd as it is the only gauge doing this), and the infamous dissolving trip-ometer gear repaired.