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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > What's the correct normal operatiting temperatures for the N52



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      04-22-2013, 05:25 PM   #23
Three_thirty_I
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Originally Posted by e90pilot View Post
No just the numbers after "KR"
Strange that it does not work on your car. Yep, just the numbers, not the letters. Does it not show the lock as off after entering the added numbers?

Here's the complete instructions for the BC Hidden Menus...
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      04-23-2013, 10:35 AM   #24
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      04-23-2013, 11:07 AM   #25
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Thanks for BC hidden code link, and it worked once I added up just the last 7 digits of Vin#.

My temp was from 199F to 219F from 30 mins of driving home from work.

PS I love how it stays on until you either turn off car or hit trip button again.

Good stuff!

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      04-23-2013, 07:46 PM   #26
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I might of done a bad thing? When trying to exit the system I accidentally activated the reset system.

What exactly did I do? Did it wipe out latest software version that dealer installed back in Jan?

Thanks for any help on this,
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      04-24-2013, 08:29 AM   #27
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Anyone? Know what exactly all I reset?

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      04-24-2013, 09:05 AM   #28
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Have no idea! Does it mention anything about it on that link I posted? As far as I know, this hidden menu is literally just a way of accessing information, and nothing that is done there is permanent or potentially harmful to the car, but with that said, I am always very very careful about what I do and find out first before taking a chance.

I highly doubt that it would have changed your software, if it was as quick and easy as that then the dealers would be able to update the software a lot quicker/easier too! Has anything actually changed since this reset?
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      04-24-2013, 10:28 AM   #29
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Well it says software reset on that page...

It reset clock, average mileage, average speed & brightness of cluster.

So far that's all I noticed...

Thanks,
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      04-26-2013, 06:51 PM   #30
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Originally Posted by MrDummy View Post
Well it says software reset on that page...

It reset clock, average mileage, average speed & brightness of cluster.

So far that's all I noticed...

Thanks,
MrD
Well, menu 1.06 shows software version, maybe see if it is the same as the one that you say was recently loaded. The only other thing that I can think that it would have possibly reset (not sure, just a guess) is the various adaptations...
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      04-29-2013, 09:10 PM   #31
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Hmm thanks ill pull my paper work from Jan and see what latest software was and check, then post results...

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      04-30-2013, 08:33 AM   #32
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Originally Posted by MrDummy View Post
Hmm thanks ill pull my paper work from Jan and see what latest software was and check, then post results...

MrD
+1!

Very interested to know also and hope nothing was changed ultimately!
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      04-30-2013, 08:59 AM   #33
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70 - 110 degrees celsius.

Car throws yellow warning of "overheating imminent" at 120 degrees celsius, throws red warning of "engine overheating" at 130 degrees celsius
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      04-30-2013, 09:19 AM   #34
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70 - 110 degrees celsius.

Car throws yellow warning of "overheating imminent" at 120 degrees celsius, throws red warning of "engine overheating" at 130 degrees celsius
Thanks!

Mine is definitely stuck in the cold higher output setting for some reason! Mostly sits between 77 and 84 Celsius, but the other day when paying careful attention to the temperatures, it did briefly spike to 99 Celsius for a few seconds and then down again! Very very odd!
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      04-30-2013, 09:52 AM   #35
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Quote:
Originally Posted by Three_thirty_I View Post
Thanks!

Mine is definitely stuck in the cold higher output setting for some reason! Mostly sits between 77 and 84 Celsius, but the other day when paying careful attention to the temperatures, it did briefly spike to 99 Celsius for a few seconds and then down again! Very very odd!
It fluctuates with whatever type of driving you're doing.

Usually (seemingly backwards) runs warmer at highway speeds, but runs cooler if you do a lot of city driving.

In winter, I just shoot for the car to get above 70 degrees C to be considered "at operating temperature" I have tracked my car several times, and the highest I've ever seen within normal range is 111 degrees C. I'd imagine anything much more than that is a sign that something is up.
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      05-01-2013, 10:27 AM   #36
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It looks like I did reset latest software or firmware from what I made out of the paperwork. But it seems like they wouldn't allow that?
Then again its a hidden code function that us owners shouldn't know about...

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      05-01-2013, 10:57 AM   #37
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How did you activate the system reset? which section were you in?

(yes i know about the hidden menu, I'm asking about which of the 20 something sections did you go to to reset the software)
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      07-11-2016, 06:41 PM   #38
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Three_thirty_I, do you have an update on your situation? I read on a different forum that someone had the same problem. They replaced the thermostat and had no increase in temp until they 'reset the adaptions'.

I have the same problem. Stuck at around 75-85c. Considering this is the 'high output mode' I guess there shouldn't be a problem with pushing the engine with this coolant temperature.

That is my main worry as my fuel economy seems to be fine. Getting my Performance Exhaust tomorrow so I want to be able to push it!
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      07-11-2016, 07:36 PM   #39
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Originally Posted by sleepysnake View Post
Three_thirty_I, do you have an update on your situation? I read on a different forum that someone had the same problem. They replaced the thermostat and had no increase in temp until they 'reset the adaptions'.

I have the same problem. Stuck at around 75-85c. Considering this is the 'high output mode' I guess there shouldn't be a problem with pushing the engine with this coolant temperature.

That is my main worry as my fuel economy seems to be fine. Getting my Performance Exhaust tomorrow so I want to be able to push it!
Hi there,

I actually just replied to your PM a few minutes ago, but to answer your question. Sadly no, I am still struggling with these cooler than normal operating temperatures. I am curious about the resetting of adaptations, but in my case it is another annoying issue - just after I replaced the thermostat I took the car to an ECU specialist and they actually changed and programmed another ECU for my car with all adaptations reset. Made no difference. And I had a bit of a battle with these people at this ECU place arguing that there was nothing wrong with my coolant temps - they were basically saying that the "internet is wrong". I have seen too many vids of other N52 engined cars that show the correct coolant temps, and a family member has fairly recently purchased a used X3 which has an N52 2.5i and it also runs at the correct temps. In fact, it manages its temps much like my E46 - if you drive sedately, the temps are on the higher end of the scale (obviously the E46 M54 runs a bit cooler than the N52), and then if you drive a bit harder it brings the temps down a bit. On my car, it mostly stays around the 80 degree C mark, but randomly it might briefly climb to 96 degrees and then shoot back down again.
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      07-11-2016, 09:52 PM   #40
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Quote:
Originally Posted by Three_thirty_I
Quote:
Originally Posted by sleepysnake View Post
Three_thirty_I, do you have an update on your situation? I read on a different forum that someone had the same problem. They replaced the thermostat and had no increase in temp until they 'reset the adaptions'.

I have the same problem. Stuck at around 75-85c. Considering this is the 'high output mode' I guess there shouldn't be a problem with pushing the engine with this coolant temperature.

That is my main worry as my fuel economy seems to be fine. Getting my Performance Exhaust tomorrow so I want to be able to push it!
Hi there,

I actually just replied to your PM a few minutes ago, but to answer your question. Sadly no, I am still struggling with these cooler than normal operating temperatures. I am curious about the resetting of adaptations, but in my case it is another annoying issue - just after I replaced the thermostat I took the car to an ECU specialist and they actually changed and programmed another ECU for my car with all adaptations reset. Made no difference. And I had a bit of a battle with these people at this ECU place arguing that there was nothing wrong with my coolant temps - they were basically saying that the "internet is wrong". I have seen too many vids of other N52 engined cars that show the correct coolant temps, and a family member has fairly recently purchased a used X3 which has an N52 2.5i and it also runs at the correct temps. In fact, it manages its temps much like my E46 - if you drive sedately, the temps are on the higher end of the scale (obviously the E46 M54 runs a bit cooler than the N52), and then if you drive a bit harder it brings the temps down a bit. On my car, it mostly stays around the 80 degree C mark, but randomly it might briefly climb to 96 degrees and then shoot back down again.
Try logging the temps, thermostat position and water pump speed with testo or simply watching them with INPA. If you live in a cooler climate you will need to drive the car while connected to a laptop.

Armed with actual data you should be able to locate your problem.

I think you will find that the thermostat just opens at 80c and the water pump speed is used to regulate block temp while the fan speed Is used to regulate the inlet coolant temperature.

Climate control settings change these values somewhat. Try turning your AC or heater off and watch your water temps rise as the water pump will run slower.
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      07-11-2016, 10:11 PM   #41
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Quote:
Originally Posted by rjahl View Post
Try logging the temps, thermostat position and water pump speed with testo or simply watching them with INPA. If you live in a cooler climate you will need to drive the car while connected to a laptop.

Armed with actual data you should be able to locate your problem.

I think you will find that the thermostat just opens at 80c and the water pump speed is used to regulate block temp while the fan speed Is used to regulate the inlet coolant temperature.

Climate control settings change these values somewhat. Try turning your AC or heater off and watch your water temps rise as the water pump will run slower.
I am going to still get my diagnostics PC sorted out, and want to also get my notebook sorted out so that I can take live data readings while on the road. So I gather testo will show what the thermostat and water pump is doing, so one can then determine if the thermostat is not regulating the temp or the pump is not correctly regulating the coolant flow? I can only think that while the thermostat typically regulates the temperature, it's also the water pump that plays a part, so just like you get a thermostat that is mechanically stuck open, makes me wonder if you don't have a water pump that doesn't regulate properly and moves too much coolant when it's suppose to either be a lot slower or not at all.

I have actually tried playing around with the climate control settings while monitoring the coolant temp, and didn't really make any difference. We have fairly warm summers, but winter at the moment and while it does get close to the 0 C mark over here, that's only on the coldest nights, usually above 10 C during the coldest days, so I would classify as anything other than moderate temperatures in general. And what I have observed is regardless of weather, so at least whatever it's doing, it is able to "maintain" what it thinks is the correct temperatures. Just need to figure out why it is these lower temps rather than the correct temperature ranges.
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      08-13-2016, 11:36 AM   #42
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Quote:
Originally Posted by Three_thirty_I View Post
I am going to still get my diagnostics PC sorted out, and want to also get my notebook sorted out so that I can take live data readings while on the road. So I gather testo will show what the thermostat and water pump is doing, so one can then determine if the thermostat is not regulating the temp or the pump is not correctly regulating the coolant flow? I can only think that while the thermostat typically regulates the temperature, it's also the water pump that plays a part, so just like you get a thermostat that is mechanically stuck open, makes me wonder if you don't have a water pump that doesn't regulate properly and moves too much coolant when it's suppose to either be a lot slower or not at all.

I have actually tried playing around with the climate control settings while monitoring the coolant temp, and didn't really make any difference. We have fairly warm summers, but winter at the moment and while it does get close to the 0 C mark over here, that's only on the coldest nights, usually above 10 C during the coldest days, so I would classify as anything other than moderate temperatures in general. And what I have observed is regardless of weather, so at least whatever it's doing, it is able to "maintain" what it thinks is the correct temperatures. Just need to figure out why it is these lower temps rather than the correct temperature ranges.
Hey Three_thirty_I,

I'm having the exact same temperature problem as you do on the other side of the globe (funny time we live in, right?).

Do you have any developments since July?

marvel.marv

Here's my similar topic on bimmerfest (hope posting this is not against the rules, if so I'll remove it):
http://www.bimmerfest.com/forums/sho...d.php?t=909770

Last edited by marvel.marv; 08-13-2016 at 01:56 PM.
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      08-14-2016, 09:02 PM   #43
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Hey Three_thirty_I,

I'm having the exact same temperature problem as you do on the other side of the globe (funny time we live in, right?).

Do you have any developments since July?

marvel.marv

Here's my similar topic on bimmerfest (hope posting this is not against the rules, if so I'll remove it):
http://www.bimmerfest.com/forums/sho...d.php?t=909770
Hi there,

Well, it's at least encouraging to know that I am not the only one battling with this. And no, sadly no further progress made in solving this. And reading your posts on the other side, you even replaced the coolant pump, this was the last part of the equation that I was considering as being a possible problem.

In summary, I have done the following since I was aware of this issue. First I replaced both temperature sensors (which rarely fail but were fairly cheap to replace), as well as give the engine fresh OEM coolant with distilled water. After that made no change, but a year or so later, I decided to replace the thermostat with new OEM part, so again fresh coolant mix. And again, no real change. I then took the car to an ECU specialist and they swapped out my ECU for another unit and reprogrammed, and even that didn't make a difference. So really not sure what more to do...

My fuel consumption isn't great, but it's not that bad in reality.
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