Hot air blower contiuously on

[lg58]

I drove the car yesterday and when I switched ignition off the fan stayed on the only way to stop was to take out fuse.
Has anyone else had this and how do you solve.

Also rear wiper has stopped working any ideas how to fix

thanks in anticipation

 

[Mark_Bennett]

Do you mean the cabin fan?
If so I had a similar problem with a 944 - it turned out to be the ignition switch still making contact. This would sometimes happen after I left the car - and the battery would be flattened.

If you mean the engine fan then ignore above []

 

[Gary C]

The blower is controlled by the 'blower control unit' according to the circuit diagram. This unit has 12 connections !, and two connections both go to the engine compartment blower and may make it run.

Trying to locate a diagram of the blower control unit, but either thats not working, or you have a short.

http://www.dietersmotorsports.com/tech/2001/03-01_911_heater.htm has some info.

It seems as if the control unit can turn on the fan if it thinks the engine is getting too hot, so maybe a sensor is goosed

 

[Geoff_Fields]

Assuming that fuses are OK. Here is what caused my wiper to stop.
Remove the cover from the wiper motor being careful to catch any loose bits.
Check that the brushes are in contact with the commutator; The tension on these brushes is achieved by a spring, which is attached via a fibre insulating washer at one end. The washer can fail with age and so releases the tension on the brushes. Replace washer if necessary with a suitable fibre or plastic one of same size.

 

[paul kelley]

Hi ig58

Try contacting the 3.2 Reg Sec Charles Marsland....01732 848323 He should be able to give you a guide as to what to look for. Good luck.

Have fun

Paul Kelley

 

[paul kelley]

Hi ig58

Can you let us know how you are getting on with your heating problem? It is helpful to others if you can give some feedback from your investigations. Hope all is well.

Have fun

Paul Kelley

 

[nathan 1981 930 G50]

Check the fuses in the engine compartment. I even had to replace the whole fuse block assy once. I'm pretty sure this kept the heater running as unbelievable as it sounds.