The stuck tstat may have been a one-off that tripped the SES. I would monitor real-time as you just did semi regularly to see if you can catch it stick high or low.

Not likely to stick closed completely, just either not open all the way or the heater not working to open early/more. Will cause it to run hot


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Agreed with Andrew. When my T-Stat was stuck, it never threw a SES. I just happened to found it on a random scan prior to my Smog.

What did you do to / for your E53 today??
 

I had really bad mileage for months till it got cold enough outside that I couldn’t get cabin heat. Probably drove five or 6000 miles with the thermostat that with engine get to the close loop.

Do I have a bias against the moronic non gauge. You can believe it.

Well....

I was doing my front bearings and seals and I found a leak of coolant. My radiator tank was weeping at the seam to the header plate. Over here it's possible to get the crenelated (sp?) aluminum so I pulled the tank of and put in a new o-ring gasket sized XXXXL (that's what she said![emoji1787]) and so far so good [emoji1696]

If you have a leaking radiator that's not from the core itself or header plate/core connection you may be able to rebuild it yourself instead of replacing the whole radiator. [emoji383]

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On my trip from NJ to Pittsburgh yesterday engine temp on the highway at 80 was about 90-92ºC with outside temp around 36ºF Not sure where it should be at.

That sounds about right. I think you may have had an intermittent issue from maybe a failing wire in the heating element. Did your error show a snapshot of the temp at the time it tripped ?

Just listed engine temp - 93c and 92.25c

93 at idle is hotter than I recall my motor being pretty much ever but I have M54. I thought I saw mention you have V8? Anybody else with V8 have a control reference?

My 4.8 runs 93c yet when I really get into it for short hard blasts I'll run 96c.

I've hit 101 several times but that's when air temps reach 50c-56c, so not sure if 1100m and 13% humidity can be factored for his 8 cylinder?

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