2001 C2 engine compartment fan

[stan]

I purchased A 2001 C2 996 with 18K and have A few questions.

1) when does the engine compartment fan turn on,as so far I have not seen it function.

2) How do you change brake rotors,Torque spec. etc.

3) When I drive for a while in hot weather with the air on,as I shut down the engine I hear A whisle for about 5 seconds coming from under the car.

(air condtionig pressure?)

The car preforms better than I ever expected and Cannot believe the quality,as this is the first used car I ever bought.

Thanks for your help

[Loren]

1) when does the engine compartment fan turn on,as so far I have not seen it function.

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 > 80 degrees C OR the coolant temperature is > 102 degrees C.

After-running of engine compartment fan

If the ignition is switched off and the engine compartment temperature is more than 60 degrees C , 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 > 85 degrees C , the engine compartment fan is switched on for 20 seconds. If the engine compartment temperature is still > 85 degrees C after this time, the fan remains on for a further 30 seconds.

2) How do you change brake rotors,Torque spec. etc.

Remove the wheel and caliper. Then remove the two screws that hold the rotor on. Remove the rotor. Installation is the reverse. The caliper bolts are 63 ft-lbs and the wheel bolts are 96 ft-lbs.

3) When I drive for a while in hot weather with the air on,as I shut down the engine I hear A whisle for about 5 seconds coming from under the car.

(air condtionig pressure?)

Most likely the AC. But not normal. Could be the pressure is too high and the AC relief valve is venting.

[stan]

Thanks for information Loren.

This sound is sort of like the hiss of a refridgarator after it stops its cycle, but more of A whistle. I have owned the car for about 8 weeks and this happens on and off.

If this is high pressure in the system, is it venting feon? AC is cold now and sweats with humid Chicago weather.