Thread: [E46] Overheating M3 E46
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Old 19th June 2017, 12:46 PM   #2
WIL35
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Join Date: Apr 2013
Posts: 76
Car: 2003 BMW M3
Colour Combo: Carbon Black, Black Interior
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My temperature usually goes up to the middle of the gauge quite quickly from cold, then I see the temperature drop momentarily when the thermostat opens. Sounds like your thermostat didn't open.

The aux fan would be running because the air conditioning was on, rather than because the temperature of the water in the rest of the system had triggered it (particularly in the bottom hose of the radiator, where the thermoswitch is).

If it needs a new thermostat, it isn't a bad job to change, all easy to access at the front, top of the engine.
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