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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 07-06-2016, 08:42 PM   #1
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Summer and yet another cooling question.

Today was a pretty hot day around here and I was stuck in traffic at noon for a nice 45 minutes surrounded by other 300 running cars.

I became concerned about the temp raising due to being stuck, with 90F outside and the A/C on so I used the hidden OBC.

To my surprise, the temperature was a stable 89C, when I got out to the freeway the temp raised to 100C, then decreased to a solid 95C and stayed there the rest of the trip (?).

Is this just the way it works or my thermostat is saying goodbye?

Never had a car before that ran cooler in a traffic jam rather than the freeway.
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Old 07-06-2016, 09:07 PM   #2
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Totally normal our cars have an electrically heated thermostat, during stop and go the element heats up the wax in the thermostat opening it up, lowering the coolant temperature. Highway driving you want higher coolant temps for efficiency so the thermostat closes a bit causing higher temps. Nice system if you ask me!
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Old 07-07-2016, 06:38 AM   #3
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You must have a very good electric fan and/or clutch fan - they are responsible for the low temp at idle after the car has reached op temp. Even with the t stat wide open on a hot day in traffic without working fans you would overheat. On the freeway the dme shut off the fans as speed is an input in the final output calc to fan.
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Old 07-07-2016, 08:18 AM   #4
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Great, good to know. This car never ceases to amaze me. Thanks guys!
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cooling system, temperature, thermostat

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