Inoperative fan 996 911 Cab 2001

[shubchs]

know there have been numerous discussions on this topic, but one not covered, and one I need to check out is:

1. How to activate the engine fan manually?

2. The reason is i am wondering if my fan is operative at all. Although the ambient temp is hovering around 88 degrees, the engine temp is on the end of the 180 degree mark on the gauge, but the fan did not come on when driving, nor did it come on when I parked the car. I have taken to opening up the engine compartment to compensate.

3. Does opening up the engine compartment after driving preclude the fan from kicking in?

4.What does the code P1128 and P1130 signify on a read out of faults?

TIA

Steve Hubbard

PCA member since 1961

[Loren]

You are talking about the engine compartment purge fan1 -- not the front radiator fans - correct?

[shubchs]

You are talking about the engine compartment purge fan1 -- not the front radiator fans - correct?

Thanks for the reply Loren, it's been awhile!

Yes, I was talking about the engine compartment fan, on my car (with the aero kit), a 996 2001 Cab, The fan in question is located on the underside of the engine compartment lid.

I note you called it fan 1. Is there another fan called purge fan 2 or more?

And while I'm thinking about it, I have never heard the fans in the front (the radiator fans), is there a way i can turn them on manually also? Because of the factory Aero kit, I have three radiatiors in front, one being in the middle.

I don't know how you do it Loren, all the questions on these cars, let alone all the other models, how the heck do you do it?

Best regards,

Steve

[Loren]

The engine compartment purge fan rarely comes on. Mine has only come on twice -- and I live in 90 plus degree California! Here are the conditions the fan comes on at.

From the service manual...

"Switch-on conditions for engine compartment fan (this fan pulls air into the engine compartment) The engine compartment fan is switched on when the engine compartment temperature is > 176 degrees F or the coolant temperature is > 216 degrees F.

After-running of engine compartment fan

If the ignition is switched off and the engine compartment temperature is more than 140 degrees F, the DME control module remains in readiness for another 20 minutes. During this time, the engine compartment temperature is retrieved every 10 seconds. If the engine compartment temperature is > 185 degrees F , the engine compartment fan is switched on for 20 seconds. If the engine compartment temperature is still > 185 degrees F after this time, the fan remains on for a further 30 seconds."

You will need a tool like a PST2 or PIWIS tester to manually turn on the fans for testing. Not sure if the latest Durametric can do this or not.

[shubchs]

Thanks Loren, will the tester you mentioned (PST2 or PIWIS) also turn on the front radiator fans?

The engine compartment purge fan rarely comes on. Mine has only come on twice -- and I live in 90 plus degree California! Here are the conditions the fan comes on at.

From the service manual...

"Switch-on conditions for engine compartment fan (this fan pulls air into the engine compartment) The engine compartment fan is switched on when the engine compartment temperature is > 176 degrees F or the coolant temperature is > 216 degrees F.

After-running of engine compartment fan

If the ignition is switched off and the engine compartment temperature is more than 140 degrees F, the DME control module remains in readiness for another 20 minutes. During this time, the engine compartment temperature is retrieved every 10 seconds. If the engine compartment temperature is > 185 degrees F , the engine compartment fan is switched on for 20 seconds. If the engine compartment temperature is still > 185 degrees F after this time, the fan remains on for a further 30 seconds."

You will need a tool like a PST2 or PIWIS tester to manually turn on the fans for testing. Not sure if the latest Durametric can do this or not.

[Loren]

Thanks Loren, will the tester you mentioned (PST2 or PIWIS) also turn on the front radiator fans?

Yes. It can test both stage1 and stage 2 of the fans (low and high speed).

[shubchs]

Thanks again Loren, I was glad to hear that you out there in CA has only had the fans come on a couple of times. At any rate, I'll get a tester and see what haps.

Yes. It can test both stage1 and stage 2 of the fans (low and high speed).