Up or down air flow correct on rear lid fan?

[GreggT]

Seems like some cars have fans with down directed air and some w/up??...is this possible?.......(talking both 996 and 996TT).....TIA.

[Loren]

There was a TSB on this for a few Carrera's with Aerokits. The purge air fan in the engine compartment had the wire polarity reversed on the plug connector. On the these cars the fan incorrectly blew hot air out. (The fix is relatively simple as you just reverse the pins on the fan plug.)

The correct function is for the fan to draw in cool air. You can test this (when the fan is running) by holding a sheet of paper between the spoiler and the engine compartment lid in the area of the ventilation slots. If the fan is functioning correctly, the sheet should be sucked on to the engine compartment lid.

[GreggT]

Very interesting.....thanks Loren.

[ninsei]

Hi. I wanna check mine. I remember seeing the TSB for that, but now I can't seem to find it.

[wross996TT]

Hi. I wanna check mine. I remember seeing the TSB for that, but now I can't seem to find it.

You don't need the TSB to check it???....use Loren's procedure with the piece of paper if you can't feel the air flow yourself.

[phillipj]

I think he means how do you engage the fan to check it.....

[Chuck Jones]

You either have to have a PST2 or PIWIS to check the activation of the fan or drive the hell out of it then turn it off and wait for the thermostat to kick in. Usually, mine will kick in about a minute after I shut it off in the garage.