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Old 01-22-2013, 06:19 PM   #26
OEM ///Member
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 22,832
My Ride: 330CiC, M5, X5, E93
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.
Solve your misfires, lean codes, rough idle -

Fuel pump failures -

Temp Info -

Hidden OBC Menu - Check Voltage, Temp, Fuel Level -

E46/E39 GM5 Door Lock Info -

Lower hose temp switch O-ring - BMW #13621743299

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