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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 04-03-2017, 03:28 PM   #1
E46-320d-2004
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Join Date: Apr 2017
Location: Belgium
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My Ride: E46 320cd
E46 320d engine temperature issue

Hello guys,

Im new to the forum since I recently bought an E46 coupe. I've browsed some threads before but I just created this account.

Since I've bought my E46 320d coupe from 2004, I've had a few issues.
One of them is my engine temperature. The engine takes a long time to warm up and hit the 12 on clock, even when driving fast. I'd say 15-20 minutes when I drive on the highway.

Sometimes after hitting the right temperature it drops a little, like its cooling. I'e read about the climate control and heating causing slow warm ups etc so I tried with heating off but the best I get is 10 minutes on the highway. And it even drops from time to time.

I've read on the forums that this could be caused by a failing/broken thermometer or temperature sensor? I called my local garage (not dealer) and told him the issue. He said shouldn't be temp. sensor but could be either EGR or another main thermometer?

I'm not really experienced in these stuff and English isn't my native language so I hope I am clear enough for you guys.

Any help is much appreciated,
Thanks in advance!
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Old 04-04-2017, 08:02 AM   #2
markusmarkus
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Join Date: Jul 2008
Location: USA
Posts: 5,933
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Welcome. Google "BMW E46 hidden obc functions." Test #7 will show you the coolant temperature as seen by the engine computer. Now, here in the USA we see very few BMW diesels, so bear with me. E46 gas/petrol engines are designed to run in the 95*C-100*C range. This maximizes economy and reduces emissions. I bet your Diesel engine has a similar "best operating" temperature range. Check that first.

In gas engines the thermostat is responsible for getting to and maintaining the engine in that temperature range. I bet your engine has a thermostat. That'd be my first suspect as thermostats are designed to fail in the open position.
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Old 04-04-2017, 03:26 PM   #3
E46-320d-2004
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Hey Markus,

Thanks for you help. I will try the hidden obc functions
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Old 04-05-2017, 07:16 AM   #4
markusmarkus
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Quote:
Originally Posted by E46-320d-2004 View Post
Hey Markus,

Thanks for you help. I will try the hidden obc functions


Glad to help.
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