Super-low coolant temp after driving - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 12-05-2008, 03:04 PM
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Super-low coolant temp after driving

My automatic '91 525i had a peculiar problem today. I noticed halfway through my 8.5 mile trip to college, my coolant temp was in the high blue mark. It had raised at a normal pace up until then and then stuck there, or so I thought. I turned off the heat, and it didn't do much of anything for the indicator.

On the way home, I had the same problem. I took it extra easy on the engine in case it wasn't just a thermostat error or something like that.

So I pop the hood once I'm back here at the house, touch the motor, and it's cool to the touch. Same for the radiator's tank; I carefully opened it and there was a low hiss, but the coolant was already cool. The bleeder valve seemed fine, I had enough coolant... It's certainly strange. It was just around freezing today, not any colder than the car's already seen so far this season.

What might the culprit be? I would really hate to damage the motor. For what it's worth, the car drove perfectly normal for it being a colder day, it took a while to shift (bad trans) from the cold start and a few minutes of warmup, but after that acceleration and shifting were normal.
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#2 (permalink) Old 12-05-2008, 03:45 PM
OMFG another one!?
 
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This seems like a thermostat problem, either stuck open or missing.

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#3 (permalink) Old 12-06-2008, 08:33 AM
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My 528i temp gauge would stay in the blue while driving and would go to 12 o'clock position when just idling. I changed the thermostat and now it stays at the 12 o'clock position steady after running for a few minutes. Try the thermostat. Remember to bleed the air out of your cooling system after changing the thermostat.
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#4 (permalink) Old 12-06-2008, 01:16 PM
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Thermostat

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#5 (permalink) Old 12-09-2008, 01:15 PM
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thermo

your thrermo stuck open
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#6 (permalink) Old 12-09-2008, 09:10 PM
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and bleed, and bleed, and bleed, and bleed, and bleed, and bleed, etc. etc.



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