Engine fan not working

[airdelights]

I have a 1999 Carrera that seems to be running a little hotter than normal, around 190 degrees instead of the normal 180 degrees. Seems to run hotter when driving at 50 miles an hour then cools slightly when you slow down to 25 miles an hour.

I looked at the engine compartment and noticed the fan was not running.

Wondering if this is normal or should the fan be operating when the engine temp is at 190 degrees. If so, any ideas on how to troubleshoot? I'm thinking it could be a blown fuse, but not sure which fuse is for the engine fan.

Any suggestions?

thank you,

steve

[vette67]

If you use the Search function, you will find a bunch of info re: when your fan(s) should be running.

[slbates]

I have a 1999 Carrera that seems to be running a little hotter than normal, around 190 degrees instead of the normal 180 degrees. Seems to run hotter when driving at 50 miles an hour then cools slightly when you slow down to 25 miles an hour.

I looked at the engine compartment and noticed the fan was not running.

Wondering if this is normal or should the fan be operating when the engine temp is at 190 degrees. If so, any ideas on how to troubleshoot? I'm thinking it could be a blown fuse, but not sure which fuse is for the engine fan.

Any suggestions?

thank you,

steve

190 is quite normal

I have attached some info I got back several years ago from the dealer. Loren, please correct anything that may be out of date.

Engine Temperature

Ambient temperature approx. 20° C (68° F)

Engine Idling @ 680 rpm (+/-20)

Coolant temperature 90-95° C (194-203° F)

All loads switched off.

Electric fan, speed 1

Coolant temperature higher than 96.75° C or air conditioning switched on.

Electric fan, speed 2

Coolant temperature > 102° C or air-conditioning fluid pressure switch closed (coolant pressure > 16 bar).

[1999Porsche911]

The OP is talking about the engine compartment fan. To test it, warm up the engine and then unplug the engine compartment sensor cable from the sensor. The fan should start immediately. The sensor is on the passenger side of the engine, on top, between the first and second intake tubes. In normal operation, this fan only comes on when the engine compartment temperature reaches something like 180F. Loren has posted the exact specs somewhere on this forum if you need the precise details.

Edited February 24, 2008 by 1999Porsche911