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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 > Coolant temp. again not stable....



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      09-02-2016, 10:30 PM   #1
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So I just have my D back from the dealer. My car has 152000 km . I started to notice back in February that my coolant temp wasn't stable as before. Since I bought it new, it always been at 86C. I began to fluctuate in between 79C to 107C. Not cel so dealer never wanted to investigate so last week I got a cel. They changed a few sensors and scr tank and metering valve and coolant fan.They replaced everything and asked them to do a coolant flush as well as replace my thermostat. Got my car back this morning only to find out that I still have a lot of variation with my coolant temp going all the way up to 99C without even flooring the car. I don't know what to do ?
Car is a 2011 m-sport 335d


So my car is back at the dealer and they are pulling off the intake to check for carbon buildup and they are replacing both turbos.
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      09-03-2016, 12:29 AM   #2
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Could be a sensor issue. Worth investigating.
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      09-03-2016, 10:06 AM   #3
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I really need help please....
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      09-03-2016, 11:02 AM   #4
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Air in the system?
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      09-03-2016, 11:51 AM   #5
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They have changed the coolant and ts at the dealer.
Air in system or bad coolant temp sensor ?
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      09-05-2016, 03:17 AM   #6
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Quote:
Originally Posted by 335dM View Post
So I just have my D back from the dealer. My car has 152000 km . I started to notice back in February that my coolant temp wasn't stable as before. Since I bought it new, it always been at 86C. I began to fluctuate in between 79C to 107C. Not cel so dealer never wanted to investigate so last week I got a cel. They changed a few sensors and scr tank and metering valve and coolant fan.They replaced everything and asked them to do a coolant flush as well as replace my thermostat. Got my car back this morning only to find out that I still have a lot of variation with my coolant temp going all the way up to 99C without even flooring the car. I don't know what to do ?
Car is a 2011 m-sport 335d
Alot of threads on this. Use only original termostats and did the dealer change both stats??
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      09-05-2016, 08:21 AM   #7
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Quote:
Originally Posted by SoZoX
Quote:
Originally Posted by 335dM View Post
So I just have my D back from the dealer. My car has 152000 km . I started to notice back in February that my coolant temp wasn't stable as before. Since I bought it new, it always been at 86C. I began to fluctuate in between 79C to 107C. Not cel so dealer never wanted to investigate so last week I got a cel. They changed a few sensors and scr tank and metering valve and coolant fan.They replaced everything and asked them to do a coolant flush as well as replace my thermostat. Got my car back this morning only to find out that I still have a lot of variation with my coolant temp going all the way up to 99C without even flooring the car. I don't know what to do ?
Car is a 2011 m-sport 335d
Alot of threads on this. Use only original termostats and did the dealer change both stats??
Us 335d only has 1 stat.
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      09-08-2016, 08:23 PM   #8
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Normally there is a stat on top of the EGR cooler and a main one that sits behind the EGR cooler. These are meant to run in the 90's for sure and stats if replaced need to be OEM parts.
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      09-09-2016, 11:22 AM   #9
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Quote:
Originally Posted by DarrenO View Post
Normally there is a stat on top of the EGR cooler and a main one that sits behind the EGR cooler. These are meant to run in the 90's for sure and stats if replaced need to be OEM parts.
In the US the only thermostat is on the water pump, we do not have any EGR thermostats. Its meant to run at 88C.

Really Im not sold on the OEM idea either. When an OEM part is known to fail prematurely and often, does it really make sense to stick with the OEM part? Its not like thermostats are black magic, any manufacturer is capable of making a thermostat that works. I do wonder WHO makes the OEM part, Beck/Arnley and Mahle both make a replacement and both sell OEM parts to BMW so hard to tell. I would be just as likely to trust the Gates replacement as I am to trust those two.
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      09-11-2016, 01:05 PM   #10
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Fill your boots and use aftermarket. Aftermarket supplies which have been used in the uk (mine and Specialists experience with 30+ years of BMW experience) has shown that the job will need doing twice if it's not OEM. 88' is when the thermostats open, correct.
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      09-11-2016, 02:07 PM   #11
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Who makes the oem part and who is aftermarket? The only thing I know about that for sure is that bmw doesn't make the thermostat
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      09-14-2016, 11:49 AM   #12
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Updated!

They are pulling off the intake to check for cbu and they are replacing both turbos who's leaking
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      09-14-2016, 01:20 PM   #13
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Update

Intercooler needs to be change, both turbos, egr replaced, cbu ( they are asking BMW Canada to replace the head)
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      09-14-2016, 02:22 PM   #14
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I'm scared to ask. Who is paying for this?
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      09-14-2016, 03:19 PM   #15
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Quote:
Originally Posted by BB_cuda
I'm scared to ask. Who is paying for this?
Still under warranty
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      09-14-2016, 06:37 PM   #16
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Any idea why the turbos need to be replaced? What is wrong with them?
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      09-14-2016, 06:44 PM   #17
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They are probably caked and baked to hell considering the sight of that IC.

Prime example of what happens to these cars without proper build.

Anyways, sorry to hear about this. I'm sure BMW will take care of you!
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      09-14-2016, 09:10 PM   #18
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Quote:
Originally Posted by kydiesel35
They are probably caked and baked to hell considering the sight of that IC.

Prime example of what happens to these cars without proper build.

Anyways, sorry to hear about this. I'm sure BMW will take care of you!
What do you mean by "without proper build" ?
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      09-15-2016, 06:26 AM   #19
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Quote:
Originally Posted by 335dM
Quote:
Originally Posted by kydiesel35
They are probably caked and baked to hell considering the sight of that IC.

Prime example of what happens to these cars without proper build.

Anyways, sorry to hear about this. I'm sure BMW will take care of you!
What do you mean by "without proper build" ?
I'm assuming your completely stock correct??

No offense.
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      09-15-2016, 07:11 AM   #20
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Quote:
Originally Posted by kydiesel35
Quote:
Originally Posted by 335dM
Quote:
Originally Posted by kydiesel35
They are probably caked and baked to hell considering the sight of that IC.

Prime example of what happens to these cars without proper build.

Anyways, sorry to hear about this. I'm sure BMW will take care of you!
What do you mean by "without proper build" ?
I'm assuming your completely stock correct??

No offense.
Yes I am.
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      09-15-2016, 08:57 AM   #21
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Quote:
Originally Posted by kydiesel35 View Post
They are probably caked and baked to hell considering the sight of that IC.

Prime example of what happens to these cars without proper build.

Anyways, sorry to hear about this. I'm sure BMW will take care of you!
Maybe I'm missing something but I don't see anything with the intercooler to suggest carbon buildup? All I see is what appears the be a leak in the intercooler from some damage, letting the oil we all have in there seep out.
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      09-15-2016, 09:56 AM   #22
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Quote:
Originally Posted by Hoooper
Quote:
Originally Posted by kydiesel35 View Post
They are probably caked and baked to hell considering the sight of that IC.

Prime example of what happens to these cars without proper build.

Anyways, sorry to hear about this. I'm sure BMW will take care of you!
Maybe I'm missing something but I don't see anything with the intercooler to suggest carbon buildup? All I see is what appears the be a leak in the intercooler from some damage, letting the oil we all have in there seep out.
Look in the picture
You can see one of the boroscope
We were able to see that all the valves and seats had lots of cbu. The master tech told me it is the worse he has seen. They talked about walnut blasting but they suggested to replace the entire head.
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