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  #1  
Old 03-17-2017, 11:55 AM
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2013 35d coolant temps

I'm suspicious of a low coolant temp on my 13' 35d with 75k, this is repetitively new to me. I logged the temps this morning, it is about 35 degrees Fahrenheit outside today. On my 20 minute commute to work it hovered around 80-83 degrees Celsius which seems low? Should I just order a new pump\thermostat and get it done?

Last edited by madbim; 03-17-2017 at 01:32 PM.
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Old 03-17-2017, 12:35 PM
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I am fairly new to the 35d as well, but from journal a board member posted this:

Quote:
Originally Posted by daytonatrbo View Post
The temp should be hitting as high as 90C and should maintain above 75 even when lightly loaded. Mine is dropping as low as 65 when coasting and never got above 77.

If it's running too cold, it won't regen and will cause emissions errors.
It also kills your glowplugs and fuel mileage.
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Old 03-17-2017, 12:36 PM
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Seems a bit low but not terribly so

Mine ran about high 60s, max 70C before I changed the thermostat. It should be about 88 but even with my new thermostat I did not consistently hit that number. Haven't checked in a while now.
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Old 03-17-2017, 12:36 PM
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That's not unusual given the ambient temperature. Same here for me in MN, on average. I just had my t-stat done on my '11 X5D back in early December. I live about 20mi outside of downtown St. Paul, and ran at about 84F for most of my commute home yesterday, at 40ish F ambient.

Just keep an eye on it over time. When it starts to fail, you'll likely not even hit 80F. Even running hard for highway trips in DS, I couldn't get past 78F before I had mine replaced.
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Old 03-17-2017, 12:40 PM
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The thermostat is supposed to be open at 88C. In cold weather, it is not surprising that it hovered around 80C. Its probably just starting to become an issue, if at all.


Edited to correct myself.
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Old 03-17-2017, 12:41 PM
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Quote:
Originally Posted by CleanIsFast View Post
I am fairly new to the 35d as well, but from journal a board member posted this:
Full disclosure, I got most of my information from this thread:

https://xoutpost.com/bmw-sav-forums/...-diy-pics.html
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Old 03-17-2017, 01:34 PM
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I'll continue to monitor my temps and see if things change at all with the ambient temps. I'm getting a NOX code that keeps coming back, I was thinking it could be related to the low coolant temps and regen? Once I have more I'll update here. Thanks!

Last edited by madbim; 03-17-2017 at 01:43 PM.
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Old 03-18-2017, 12:49 AM
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Quote:
Originally Posted by madbim View Post
I'll continue to monitor my temps and see if things change at all with the ambient temps. I'm getting a NOX code that keeps coming back, I was thinking it could be related to the low coolant temps and regen? Once I have more I'll update here. Thanks!
Regens should be able to run as low as 60C, I believe.

But under 75C, glowplugs may still be active, which at a minimum means they're working extra time and you'll be running inefficiently on account of a rich mix.
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Old 03-18-2017, 08:59 AM
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Quote:
Originally Posted by basilray View Post
Regens should be able to run as low as 60C, I believe.

But under 75C, glowplugs may still be active, which at a minimum means they're working extra time and you'll be running inefficiently on account of a rich mix.
You must be right about that because the 35d I just bought had no emissions errors, so I assume regen has been continuing, or this condition hasn't existed long enough that it needs to regen. But if it is running rich, I imagine regen would be required more frequently.


What tipped me off that I needed to check my coolant temp was that my glowplug module has a burnt output. It's running overtime and can't handle the stress. I have a new thermostat, water pump, and glow module that I hope to install this after noon.
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