Engine Compartment Blower Fan Error

[jsclafani]

On a US, 6 speed 2002 911 Carrera 4S I just started receiving a system notification of a problem with the engine blower motor At the same time, I noticed the engine blower runs while driving, while stopped with the engine at idle and for about 20 minutes after I shut down the engine. The engine temp warning light also flashes. All temps are normal. It sounds like a temperature sensor problem but I can't figure out where the sensor is located to check it. Can someone tell me where the sensor is located or offer other diagnostic steps I can take. I would also like to know when the engine compartment blower is supposed to operate. Should it be on while driving?

[wross996TT]

Not an expert on this, but the fan operates based on the reading from the temp. sensor. Very possible it is a bad, disconnected sensor or thermostat (what was the actual code? P0115/16/17/18 or what). Also Check to make sure the fan is bringing air in from the top and blowing the cool air down on the engine. I have seen where the polarity is switched resulting in that fault.

Try the nifty search function as this has been covered a few times.

Edited June 8, 2009 by wross996TT

[1999Porsche911]

The sensor is installed in a grommet between the first 2 intake tubes on the top of the engine on the passenger side. There is a 2 cnductor cable connected to the back sensor. If this wire is disconnected, the fan will operate, even when the car is off and temperature is above a specific limit. It will also show up as a fault by a flashing temp light. Check the connection.