[n54335i02121997]

Couple weeks ago noticed my car warming up WAY faster and running at 235-250 in the winter for oil temp. Water pump whining loud, would not do bleed procedure. Never actually overheated. Got close.

So that first day I noticed that, I saw that the radiator fan was not kicking on. Even with AC on. Engine Coolant Temp was 203.

Tonight, replaced the water pump and thermostat AGAIN, 20 months since the last one (just as big as a bitch, but managed to get it done in 4 hours with the boys distracting me).

Temps went back to normal, started warming up at the original speed (slow), 25 degrees tonight, and cruised back about 40 miles at 200-210. Which 210 is about normal for my nighttime winter cruises.

Still noticed the fan won't kick on. Even with AC on.

So them fans are ridiculously expensive. What are some things I can check before buying a new fan that may have randomly gone out. I'm at 190k miles. Can't buy a BMW genuine because that's a hefty bill, but will get a quality one from a reputable website..

Thank you. Hoping for something simple, but assuming fan replacement.

Idling raises the temps slightly now, but when the WP was failing, idling would lower temps.

[e91Owner]

Are you getting any codes? Without knowing them (or if you don't have any), it'll be a lot of guesses.

[Efthreeoh]

Check the wiring harness, especially at the connector. I had the same situation; I had the fan failure code when I scanned the car. After 400,000+ miles, I figured the fan had shit the bed. When I went to replace the fan with a new part, I looked at the wires close to the connector. I found the small signal wire was broken. I surmised that at some point along the way a mouse chewed on the wire sheathing and nicked a hole in it. Over time, with road salts, the copper corroded away and finally the wire broke within the sheathing with no visible evidence from the outside.

I repaired the wire and have a working original fan again, and a "spare" ready to go in when the original finally gives up the ghost.