DanG144
Top Post Dawg
I have had several people tell me the fans were in fast, when indeed they were in slow. You can either do the fan tests in the first post to calibrate your ear, or listen to a similar car. But assuming you can tell...Continuously high as far as I can tell, any time the key is turned on or the engine is running. They switch off as soon as the key is removed, even if the engine is hot.
Is this even with the AC selected to OFF (on a car parked overnight)? If so...
Unplug the HP sensor, see what happens. If the fans stop, then that is the culprit. (I was wondering if your HP sensor readings were inverted. I have run into meters before that read 80% when in actuality it was 20%. If this is happening to you then you are reading very high -more than high enough to cause the fans to run in fast, almost high enough to trip off the compressor.) You can find info in the Pdfs in the first post on expected readings vs ambient temperature on a check done after being parked 8 hours. 20% is very low for the summertime.
If unplugging the HP sensor does not stop the fans, then unplug the radiator thermoswitch, see if they stop. If so, then this is the culprit. If they still run fast, and it was not the HP sensor, then it is a bad FCM. (If the ECU was asking for fast fans due to a high Coolant Temperature Sensor Signal, I think it also turns off the
AC clutch. You can check with VCDS.