[mario65]

I have a 91 964 with a confirmed bad ccu.

I read that a 993 CCU is interchangeable save the max ac button. My indy swapped it and says that the fan is stuck on high while the 993 piece is in. He had a working 964 CCU he tried and it works fine.

Is anything necessary to change before swapping to the 993 piece for it to work properly?

Any help to make this 993 piece work would be greatly appreciated.

thanks