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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > Slow or broken thermostat?
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      10-04-2019, 05:27 PM   #1
EricD735i
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Slow or broken thermostat?

My 328d seems to take forever to warm up. Drove around town (low speed, stop & go) earlier today with my Foxwell hooked up and after 25-30 min coolant temp finally got to 180. Last regen was 65 miles ago per the scan tool so itís getting up to temp eventually. Car has 68k miles. Wondering if I should swap out the thermostat before the MN winter gets going. For comparison wifeís X3d heats up on the gauge in just a few miles.
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      10-04-2019, 07:47 PM   #2
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Good call on using a diagnostic tool to read coolant temperature, since the gauge is oil temp.

I would agree that you have a stuck open thermostat.
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      10-05-2019, 08:03 AM   #3
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Originally Posted by Enabled View Post
Good call on using a diagnostic tool to read coolant temperature, since the gauge is oil temp.

I would agree that you have a stuck open thermostat.
This ^ Almost certainly a stuck open 'stat.
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      10-05-2019, 11:08 AM   #4
EricD735i
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Gonna get the parts ordered. Didnít realize the part is shared with the 35d cars. Those seem to have a lot of issues with broken thermostats.
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      10-07-2019, 12:52 AM   #5
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Quote:
Originally Posted by EricD735i View Post
My 328d seems to take forever to warm up. Drove around town (low speed, stop & go) earlier today with my Foxwell hooked up and after 25-30 min coolant temp finally got to 180. Last regen was 65 miles ago per the scan tool so itís getting up to temp eventually. Car has 68k miles. Wondering if I should swap out the thermostat before the MN winter gets going. For comparison wifeís X3d heats up on the gauge in just a few miles.
How did you know your car was taking an extended time to warm up prior to hooking the scan tool? One of the reasons I hate not having a coolant temp gauge is to monitor things like this.
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      10-07-2019, 02:58 AM   #6
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Quote:
Originally Posted by n00bkiller944 View Post
Quote:
Originally Posted by EricD735i View Post
My 328d seems to take forever to warm up. Drove around town (low speed, stop & go) earlier today with my Foxwell hooked up and after 25-30 min coolant temp finally got to 180. Last regen was 65 miles ago per the scan tool so it’s getting up to temp eventually. Car has 68k miles. Wondering if I should swap out the thermostat before the MN winter gets going. For comparison wife’s X3d heats up on the gauge in just a few miles.
How did you know your car was taking an extended time to warm up prior to hooking the scan tool? One of the reasons I hate not having a coolant temp gauge is to monitor things like this.
The oil temp does provide an indication of engine temperature. The oil temp is by far the best indicator of when the engine is in an acceptable/safe operating temperature range for driving the engine hard.

The coolant temp can be accessed by using the OBC hidden menu.

Here's a YT guide showing how to unlock it :

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      10-07-2019, 10:41 AM   #7
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I totally agree, oil temp is a much better indicator for overall engine temp.


Coolant temp is simply quicker to respond if there is an overheat condition, but you will definitely get warnings from the cluster and navigation system if the coolant temp goes too high.
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      10-07-2019, 11:16 PM   #8
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Quote:
Originally Posted by EricD735i View Post
My 328d seems to take forever to warm up. Drove around town (low speed, stop & go) earlier today with my Foxwell hooked up and after 25-30 min coolant temp finally got to 180. Last regen was 65 miles ago per the scan tool so itís getting up to temp eventually. Car has 68k miles. Wondering if I should swap out the thermostat before the MN winter gets going. For comparison wifeís X3d heats up on the gauge in just a few miles.
2 days in a row I'm at 20 min to get to 88c. This is speed up to 40mph, ambient temp 45F and 55F. Bit long for my liking.
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      10-08-2019, 04:42 PM   #9
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Quote:
Originally Posted by n00bkiller944 View Post
How did you know your car was taking an extended time to warm up prior to hooking the scan tool? One of the reasons I hate not having a coolant temp gauge is to monitor things like this.
Just the oil temp gauge taking forever to get up to temp compared to my wifeís car with same engine.
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      Yesterday, 06:02 PM   #10
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So Iíve got the car apart replacing the thermostat. Unfortunately the one I ordered didnít come with the correct gasket so Iím waiting for my dealer to get one. Someone smarter than I am explain to me how this could fail open.







The little pin in the top of the thermostat fits into a corresponding hole in the housing. From what I can tell as the coolant heats up the pin extends and pushes that end away from the housing letting coolant flow. The big spring applies pressure in the opposite direction closing the flow. If the pin didnít move I donít see how it can fail open. What am I missing?
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