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Join Date: Mar 2015
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09 328i low coolant temp on hidden menu

Help! 2009 328i low temp on hidden menu
I just drove the wife's car and engine cooling fan is running a lot on high speed.

I did the water pump test and checked to see if coolant was flowing into the expansion tank and yes it is via the small hose.

I acessed the hidden menu to ck the coolant temp and the highest it went was 40c. I live in AZ and that cant be right because it was 95 when I checked it. I grabbed my infrared temp gun and got to like 175f on the hose from rad to the pump.

Plugged a cheap scan tool in and no codes.

I'm thinking of changing the temp sensor first because of the radical discrepency from the menu temp and my infrared gun.

Most annoying is the fan screaming like a race car.
Old 08-31-2019, 08:48 AM
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