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Showing results for tags 'radiator fan'.
I'm trying to understand the outputs of the 997.1 cooling fan control unit. I understand that the fans are a continuously variable type and run in proportion to the cooling water temperature. How is the fan speed adjusted? For example, is the voltage adjusted by the control unit? Maybe 0v to get 0 RPM, to 12v to get max RPM. Or, PWM? I'm interested in using this info to add a manual override to be able to run the fan at max speed by a dash switch (but maybe needing some "smarts" if PWM is involved).
So recently i got the P480 code. Fan was running non stop on high. When i turned the car off it kept running on high so i pulled the fuse and went to bed. In the morning i threw in the fuse and the fan didn't run.....turned the car on (Cold) and after a few seconds went to high again. Turned off the car and it ran on high for a while then shut off. So i had to do a bunch of work anyways so i pulled the fan assembly, here are the steps i've done so far: AC fan works fine, this is only the main fan. If i power the fan without connecting to the car (the small wires arent receiving signal) the fan stays off (which i think is good). If i measure the car harness side, it shows the standard 12v and 0v on the plug. The signal wires show ~.3V and 12V My guess was the 12v was the cause of the fan running. To rule out the temp sensor i unplugged it, but the 12v signal was still there. plugged the fan in anyways and it was still running. I did notice when it was unplugged the car only shows as "normal" temp, it didn't peg to the top like i'd think it would. Finally i found that F10 is the signal (Fan Final Stage) Anyone have the wiring diagram or know where this 12v is coming from? I'm 99% positive it does NOT come from the main coolant sensor. And i'm also 99% my fan is working correctly, but i don't have the "before" voltage check to know for sure. Any help would be appreciated. THanks