Question about engine temperature and idle...

[anonymous-user]

Dumb question get ready.

My drive to work in our 320d (F30) usually takes 45 minutes. Mixed A and B roads. 40-50mph. 25 miles one way.

Engine operating temperature needle settles on 100 C.

There was an accident and I was sat idling away for around 20 minutes while the drivers ahead argued it out before moving to one side.

My operating temperature dropped to around 95.

I don’t know if this is because it was -4 C outside or a possible sign of a failing thermostat.

Any thoughts appreciated.

[stevesingo]

Given that the weathers is cold and you probably had the heater on, I'd say no problem.

At idle, there is very little heat produced by a diesel engine. Add to that the heat you are pulling from the engine to keep warm, I wouldn't be surprised if the thermostat was fully closed and all the waste heat was keeping you warm.

[anonymous-user]

Thanks