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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 02-23-2010, 12:45 AM   #1
Young Gun
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Join Date: May 2009
Location: GTA / Ontario Canada
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E46 Cooling - When does fan turn on?


I was having issues with my car warming up, my diagnosis was that the thermostat was stuck open. I changed it and flushed the coolant during the process.

My car warms up normally now and has an average temperature of 90 during city driving. I am in Ontario canada and our average temp out right now is 0 degrees.

While idling for about 20 mins at a car wash line up I checked my temp and was at 111, I turned the heat on and it dropped to about 101.

I am worried because the rad fan did not come on.

2 questions:

1. What is the max temperature allowable during idle?

2. At what temperature is the fan supposed to come on?

any input is appreciated.
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Old 03-18-2010, 09:36 AM   #2
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a transistor or relay located on the radiator fan might be the culprit.
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Old 03-20-2010, 09:20 AM   #3
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Your car's engine temperature is controlled by the ECU. For your model car, the target temp at idle is 102C. If the cooling fan comes on when the AC is on, then I'd say everything is OK.
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