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Old 01-22-2013, 06:19 PM   #26
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 11,474
My Ride: '06 330CiC, '03 M5
Does not matter how old the thermostat is, you need to check and verify the engine coolant temperature.

The only way you can accurately condemn a weak thermostat is during the colder Winter months.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299

Last edited by jfoj; 01-22-2013 at 06:19 PM.
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