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      11-21-2017, 02:28 PM   #1
Boatless_Hoes
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N54 Coolant Temp Issue

Hi, I've been having an issue with my 335xi recently.

The car is taking forever to warm up, and once it does, the coolant temperature will only get to around 170-180 F. Occasionally, the car will get up to the normal 200-212 F I saw before. When temps are fine, the car drives normally, otherwise the car is pretty much in limp mode 24/7. The coolant temperature frequently plummets 20, from say 200 to 180 or from 190 to 170 over 4-5 seconds.

Oil temps have been lower than normal as well, usually hitting around 170-180, but will get up to ~200.

Only error code is 2EFE: electric fan activation.

The thermostat has been replaced, but the still issue is still there. I can't seem to find anyone with a similar issue. Any other suggestions?

Last edited by Boatless_Hoes; 11-21-2017 at 04:28 PM.
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      11-21-2017, 07:15 PM   #2
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Just curious as to what you are using to monitor your coolant temp?
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      11-21-2017, 07:17 PM   #3
Boatless_Hoes
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I have the BMW performance steering wheel with the little LCD display. Also MHD, but I'm pretty sure they're pulling numbers from the same sensor.
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      11-21-2017, 08:37 PM   #4
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Quote:
Originally Posted by Boatless_Hoes View Post
I have the BMW performance steering wheel with the little LCD display. Also MHD, but I'm pretty sure they're pulling numbers from the same sensor.
Are you tuned? Have you messed with the engine cooling area of tunerpro? And lastly - do you hear your fan going non-stop? (I mention that ONLY because of your code above about the cooling fan.)

I've actually set my cooling fan to run at 89% to keep noise down. if your fan is running full speed - you should hear it.

It may be going bad and that you need to replace it. (Just a guess there).
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      11-21-2017, 08:49 PM   #5
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I'm tuned through MHD. I haven't heard the fan going at all actually, at least sitting at idle (the car is loud exhaust-wise so it hasn't been audible while moving).

I actually had my mechanic test my fan and he said it's working fine so he's not sure why it's throwing a code.
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      11-21-2017, 09:08 PM   #6
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Quote:
Originally Posted by Boatless_Hoes View Post
Hi, I've been having an issue with my 335xi recently.

The car is taking forever to warm up, and once it does, the coolant temperature will only get to around 170-180 F. Occasionally, the car will get up to the normal 200-212 F I saw before. When temps are fine, the car drives normally, otherwise the car is pretty much in limp mode 24/7. The coolant temperature frequently plummets 20, from say 200 to 180 or from 190 to 170 over 4-5 seconds.

Oil temps have been lower than normal as well, usually hitting around 170-180, but will get up to ~200.

Only error code is 2EFE: electric fan activation.

The thermostat has been replaced, but the still issue is still there. I can't seem to find anyone with a similar issue. Any other suggestions?
Quote:
Originally Posted by Boatless_Hoes View Post
I'm tuned through MHD. I haven't heard the fan going at all actually, at least sitting at idle (the car is loud exhaust-wise so it hasn't been audible while moving).

I actually had my mechanic test my fan and he said it's working fine so he's not sure why it's throwing a code.
You're talking about limp mode and DME codes, yet the mechanic says the fan is working fine. I wonder if your mechanic is confusing 'on' with 'working fine'. Sounds to me like the fan is constantly running and not shutting off when it isn't needed, hence the reason the car sounds like it's running cold. Plus you're in Chicago, which isn't exactly Palm Springs these days. Have you actually looked to see if the fan is on or off during the periods the car is running fine or not running fine?
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      11-21-2017, 09:16 PM   #7
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When stopped at a light, the coolant will drop in temperature without any fan noise.

There's no noticable fan noise. Ambients are around 40 right now, but that's never given me issues with getting up to operating temps before. I've checked the car at idle in the driveway. Temps will be around 170-180 for the coolant without the fan running.
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      11-22-2017, 11:20 AM   #8
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Quote:
Originally Posted by Boatless_Hoes View Post
When stopped at a light, the coolant will drop in temperature without any fan noise.

There's no noticable fan noise. Ambients are around 40 right now, but that's never given me issues with getting up to operating temps before. I've checked the car at idle in the driveway. Temps will be around 170-180 for the coolant without the fan running.
Not sure why are you talking about fan noise or repeating things you've already described. Who cares about fan noise? Is the fan operating when it shouldn't be, or not? That's the real question. If the fan isn't shutting off, or is staying on all the time, then either it's faulty, or something else controlling it is faulty (or is set incorrectly). Determine whether the fan is working correctly or not. Being on doesn't mean it's working properly. Being on (or off) when it's supposed to be on or off is what matters.
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      11-22-2017, 12:56 PM   #9
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In MHD there is a sport coolant setting, did you turn that on by accident? It aims for about 195F coolant and 185F coolant in race mode.

Otherwise, if the fan activation code is present, it may mean a faulty sensor in the fan but that's above my knowledge of the system.
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      11-22-2017, 03:20 PM   #10
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Quote:
Originally Posted by Jeff@TopGearSolutions View Post
In MHD there is a sport coolant setting, did you turn that on by accident? It aims for about 195F coolant and 185F coolant in race mode.

Otherwise, if the fan activation code is present, it may mean a faulty sensor in the fan but that's above my knowledge of the system.
That was actually one of the first things I checked because I remember I had the setting enabled during the summer. Unfortunately, the setting is off.
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      11-23-2017, 03:38 PM   #11
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