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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Low coolant temperature

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      02-20-2020, 09:16 AM   #111
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Drives: 2011 335d
Join Date: Dec 2012
Location: Washington, D.C.

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Originally Posted by e90Noobie View Post
Had the thermo replaced over the weekend. Temp now hovering around 197F. Reset my average MPG counter and got a steady 42mpg driving on the highway for 2 hours at around 70-80mph. MPG started out at 60 and then slowly dropped to 42.
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      03-01-2020, 05:47 AM   #112

Drives: BMW E91 320d
Join Date: Mar 2020
Location: Italy

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Hi everybody,
I have the same problem on my E91 320d...cold engine (M47) - over 270.000 km.
I had the thermostat fault error code.
After replacing both thermostats, yes I have the EGR thermostat, the error was gone but the cold engine remains.
When outside was 0 C the engine was around 55C, and yesterday with 13C, after the thermostats replacement, it was around 70C. So there is a minor improvement from the faulty thermostat: indeed the mechanic said that the thermostat wasn't really bad.
Other fault error codes still present: 46d1 the auxiliary water pump and 4212,4222, 4232, 4242, one for each glow plug, despite 2 were replaced less than a year ago, so I think there is a problem with the glow plug controller.
I am not sure that the remaining error codes are connected to the cold engine problem.
Any advice?
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