Has this ever happend to your car??? - Bimmerfest - BMW Forums

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E90/E91/E92/E93 (2006 - 2013)
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Old 01-18-2011, 06:28 AM
skpatter skpatter is offline
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Location: alabama
Join Date: Jan 2011
Posts: 8
Mein Auto: 330i
Has this ever happend to your car???

2006 330I 88K. iI noticed a coolant leak under my expantion tank. I assumed it was cracked so I replaced. A couple days later more coolant uner tank. Low coolant light would not go off because Thermostat failed in closed position. I could not get radiator to fill. I ran the bleed process 5 times 12 min each. I replaced thermostat and was able to fill radiator with coolant and distilled water. Ran great for a couple of days. Cold morning Sunday and I went outside to warm up car let idle for 10 min. no heat. I proceeded down street to warm engine and yellow engine temp light flashed. Returned home checked coolant and had coolant under expantion tank again. Thermostat failed to open again and engine overheated blowing coolant out bypass in expantion tank. I cycled the key switch cranked engine and noticed the thermostat opened and was operating fine. Filled with coolant. Let sit overnight . Cranked this am, let warm about 15 min. No heat. Cycled key switch and recranked thermostat opened and operated fine. Drove car 70 miles operated fine no coolant leaks.
My question is What sensor operates the thermostat? I am pretty sure that is my problem. Anyone have any similar issues?
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Old 01-18-2011, 07:40 AM
hpowders hpowders is offline
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Location: Tampa
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Mein Auto: BMW's: E90 and F22
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Old 10-11-2012, 11:26 AM
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Location: Virginia Beach
Join Date: Oct 2012
Posts: 7
Mein Auto: 2006 330I, 2007 530I
im having the same issue with my 330I, what was the outcome of your situation?
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