E46Fanatics - View Single Post - Need help troubleshooting thermostat error
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Old 10-07-2012, 06:34 PM   #6
Registered User
Join Date: Oct 2012
Location: San Diego
Posts: 8
My Ride: 2003 M3
I got a chance to get into the OBC menu and take the car for a closed circuit test. This is what I found.

External temp: 75F

First leg: 15 miles with AC ON
Freeway, constant 80 mph, 3k rpm
Coolant temp: started from 80C(the engine was already warm when starting) and reached a constant 86C(needle at 12 o'clock)

Second leg: 15 miles with AC OFF
Freeway, constant 75 mph, 3k rpm
Coolant temp: went from 86C to constant 83C

Third leg: 6 miles with AC OFF
Semi-surface street, constant 60 mph
Coolant temp: went from 83C to constant 80C(needle a minute or two to the left of 12 o'clock)

What do you guys make of this temp range? Do you think my engine is running cold? Is yes, it does look like its the stat does'nt it.

Last edited by 40mikemike; 10-07-2012 at 06:36 PM.
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