Both fans should be running with or without the A/C on. Needs this extra "suction" to pull air through the additional A/C condencer "radiator" sandwiched in front of the regular radiator.
On my first "dead fan" I checked the fuses, each fan seems to have it's own on my fuse block, to find one blown. Replaced it and it blew again. Took out the dead fan to find that the front bearing was sized up. Seems that even though a new 944 83 cost over $35,000 at the time, Porcshe/Bosch could only put open cage ball bearings in their fans. Fans that see the brunt of all the nasty rain, snow and sleet we drive through. Dumb!
Soooo, I matched the bearings up with a local bearing supply house and replaced the open bearings with doubled sealed bearings on the new fan and in the other fan that was still working. differance in cost between the sealed and open was less than a dollar.
No problems after ten years.
Still would like a concise electrical schematic for the 83 so I can fix my windows. (see other thread)
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