^Yes, my N62 also runs "hot." They were designed this way for economy and emissions reasons. 98c is common. I bought a colder thermostat from Logic 7 but have yet to install it.

Here is their writeup on it: BMW THERMOSTAT PROBLEM AND SOLUTION. THE MOST IMPORTANT THING ON THIS SITE!! | BMW LOGIC7

So, am: do some heated runs up a hill etc. It sounds like it should rise to 96-98 under load. Weird the error tripped at idle and 93 but I don't know the parameters where the heater kicks in to cool things off.

Maybe at idle the heater is supposed to open the tstat and keep it 90c.

Maybe one of you V8 guys can report the temp at steady state at idle.

Interesting read about the low temp tstat. Maybe your stuck open tstat is a good thing. :-).

I fitted the 80c kit from the seller in the Czech Republic £69 4.5 years ago, the thermostat has recently failed open. I contacted him via eBay as to what thermostat is fitted/fits. Almost an immediate reply with FEBI p/n cost £9 The electric "map" plug lead is fitted with a 10 ohm resistor so as not to trigger codes. The engine runs, dependant on weather conditions between 88/92c. I converted to electric fan with a 93/97 switch. Never known it to use the 97c full speed. Will cycle 2 or 3 times after switching off. Haven’t had a coolant problem/leak since fitted.


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Should have added, as a bonus (in my eyes) the g/b oil runs 84/86c


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LOL yes, I know. One thing I did notice is I've lost about 1 MPG and the oil temp only gets to the first dot past cold on the gauge. I'm probably just going to change it out because I know it's not right, even though the SES hasn't come back.

I would also, but I'm looking into the lower temp alternatives. Big deal with the 2 v 1.3bar coolant cap

Replaced my power steering pump. What a PITA! Bentleys has incorrect info and makes it look a lot easier than it is. Hoping this kills the "vibration" noise when the truck is cold and idling in gear. Signs seemed to be pointing to the pump. We'll see.

I found another loose end in the engine bay... looks like a sensor of sorts? Might have been damaged when the fan blew up, anyone know where this goes?

https://i.imgur.com/FrA5HnOh.jpg

https://i.imgur.com/tsuaLg4h.jpg

Might be related to a persistent CEL I have, think the secondary air pump might also be a culprit since it's a bit loud, need to get the codes... my ODB scanner doesn't pick up much

I found another loose end in the engine bay... looks like a sensor of sorts? Might have been damaged when the fan blew up, anyone know where this goes?

https://i.imgur.com/FrA5HnOh.jpg

https://i.imgur.com/tsuaLg4h.jpg

Might be related to a persistent CEL I have, think the secondary air pump might also be a culprit since it's a bit loud, need to get the codes... my ODB scanner doesn't pick up much