The factory design is for the fan to blow outside air down through the engine compartment. If a fan is working in the opposite direction it's not working the way the factory designed it to work.

 

That's this thread.

 

Soooo, here it goes.... Posted November 03, 2003 - 08:24 AM
This is a copy / paste from Renntech. And .. I have an Aerokit... Interesting !!! I better get it changed.!!!

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.

 

Yes, that was posted in this thread back on 06-05-2009...