judd944

I am helping a friend get his 993 HVAC control working. The small fan on the rear of the unit p/n 964.659.148.00 is staying on after the car is turned off. has anyone opened one of these up an tried to fix the unit?

When searching I found this wiring diagram
part 1
part 2
part 3

When the fan is unplugged the drain on the battery stops. ( well, it drops to normal levels)

anyone have an idea of what failed on this unit?

race911

Never bothered investigating, but same happens on my RS America. Of course with it being driven about once a year I just disconnect the battery.

911URGE

Look at this Rennlist post HERE

This is for a 964 CCU fan but it may be the same fix for the 993.

judd944

sweet! thanks! the 964 uses the same unit, I will try this and post up how it goes

Robin 993DX

This is a common issue with the 964s, I repaired several units by just unpluging the fans. The owners didn't care if they had A/C or not so it worked for them. I believe there is a fix to replace the transistor on the PCB to resolve this problem, you might want to do a search on the 964 board.

judd944

so, is this the part I need?

judd944

got it, Radio shack part # is 276-2058