Originally Posted by
geargrinder
Have you STILL not plugged in the outside temp sensor? You seem oddly dismissive and stubborn on that even though you've been told from way back that that was required for AC to be switched on.
Just plug it in, and ziptie it anyplace down there if your fender liner porkchop is damaged (I'm assuming this is why you aren't doing it properly once and for all). Please. Do it for the children. They are our future.
Here's what I think most likely happened: on that drive, engine temp rose high enough to require AUX fan on top of the visco mechanical fan, engine turned on AUX for a few minutes, engine temp cooled back down enough to not be required anymore, and shut fan off... and therefore, all that was unrelated to AC actuation whatsoever. To test that theory, you could thrash the heck out of the car for a short bit, and try to drive your engine temps as high as possible, then come to a hard stop, jump out and see if the fan has come back on again.
Also - you said "fan hitting something". Is your fan actually hitting something? The PWM fan might have an error condition sensing where it senses improper current draw or something if the fan is obstructed, and doesn't activate the fan if that happens. In fact on the M62TU I am pretty sure that logic is there - my fan once got frozen by snow-slush and I got a dashboard error about it.
However I am more likely thinking the issue is as above - AC isn't work cuz you still no plug in sensor, and this event was purely engine-temp related.
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