Cooling System

Originally Posted by SFbay

Did you do coolant pipe, right? This is indication that there is no leaks.
With 95c you'll get 93 the hottest

Where are you getting this thermostat from?

Originally Posted by 07 E63650i

Where are you getting this thermostat from?

I understand: reading 45 pages is a lot.
Tstats are special order from factory.
Only 100pcs made.
It will improve cooling system especially in traffic and idling.

Originally Posted by SFbay

I understand: reading 45 pages is a lot.
Tstats are special order from factory.
Only 100pcs made.
It will improve cooling system especially in traffic and idling.

I'm interested in this thermostat. Can you please let me know where I can order one? Also, this will thermostat will fit the N62B48 engine, right?

You're going to have to get one from him. The factory he ordered it from only did it because of 100x peices. They should be ready mid next month iirc

So first, hello everyone. This is my first post here, I have a 2005 745li, just got it last week and its got 88k miles. After reading this thread from start to finish, I figured I would share my temp results as well, since mine seem to differ from most people's here. I run between 93 and 98 at all times, no matter what happens (idle, highway, city, heat on/off etc). Aux fan turns on and off as it should, and the thermostat is opening and closing like it should. I don't have any of the computer software yet, but I do have the hidden menu telling me what the overall temp is. It was pressure tested by my mechanic prior to purchase and has no leaks. I don't know if this matters, but the car was delivered to the original owner in Honolulu, HI, and migrated to San Francisco before finishing it's journey in my garage in Phoenix AZ. I can post pics of the secret menu results if anyone wants verification.

Originally Posted by 07 E63650i

I'm interested in this thermostat. Can you please let me know where I can order one? Also, this will thermostat will fit the N62B48 engine, right?

The good thing that this tstat fits all V8 and V12 models from 2002 till now

Originally Posted by Serial70

So first, hello everyone. This is my first post here, I have a 2005 745li, just got it last week and its got 88k miles. After reading this thread from start to finish, I figured I would share my temp results as well, since mine seem to differ from most people's here. I run between 93 and 98 at all times, no matter what happens (idle, highway, city, heat on/off etc). Aux fan turns on and off as it should, and the thermostat is opening and closing like it should. I don't have any of the computer software yet, but I do have the hidden menu telling me what the overall temp is. It was pressure tested by my mechanic prior to purchase and has no leaks. I don't know if this matters, but the car was delivered to the original owner in Honolulu, HI, and migrated to San Francisco before finishing it's journey in my garage in Phoenix AZ. I can post pics of the secret menu results if anyone wants verification.

You've got no leaks and coolant pipe is good, and it will get to 102-103 when idling or in traffic or in summer.
You want a good advice???
-replace mechatronik adapter it's good mileage for it

Originally Posted by SFbay

You've got no leaks and coolant pipe is good, and it will get to 102-103 when idling or in traffic or in summer.
You want a good advice???
-replace mechatronik adapter it's good mileage for it

It doesn't get higher than 98 in traffic or idling. In fact, that's the highest I've seen it yet. Like I said, I don't have any diagnostic software yet, so I am just basing these off of the secret menu temperature reading. Thank you for the advice, are you referring to the whole mechatronic adapter, or just specific parts?

Originally Posted by Serial70

It doesn't get higher than 98 in traffic or idling. In fact, that's the highest I've seen it yet. Like I said, I don't have any diagnostic software yet, so I am just basing these off of the secret menu temperature reading. Thank you for the advice, are you referring to the whole mechatronic adapter, or just specific parts?

I know there are some DME firmware which changes those settings for tstat opening. Hawaii might have different version. Still mechanical regulation is much more reliable and faster plus it won't get anywhere higher than 93
Mechatronik adapter is a 20$ part.
You need to drop the pan and valve body. Tranny is gonna say big thank you

Originally Posted by SFbay

I know there are some DME firmware which changes those settings for tstat opening. Hawaii might have different version. Still mechanical regulation is much more reliable and faster plus it won't get anywhere higher than 93
Mechatronik adapter is a 20$ part.
You need to drop the pan and valve body. Tranny is gonna say big thank you

I apologize, I misread the post. I was thinking like the whole mechatronic valve body. I have plans to drop the trans pan soon and give it a complete flush, I don't know when it was done last. I assume it doesn't take too much longer to do that as well. I noticed that CTSC has published instructions for it on their website. Props to them as well as you for your suggestion.

Originally Posted by 745iguy

He posted in 40 days on the 2nd tis only 20 days From that, 20 days left?
Even if my car gets totaled I'm curious to see the outcome here too.

So I guess theres only 5 more days right ???

Sent from my GT-N7000 using Bimmer App

Should be according to the posts. I cant speak for sf though so if he would be so kind to chime in

Well update on my 750:-)) still running cool. Today temp hit 55 in the city my car still running nice and cool

In traffic. But like I said I'll take a stact when ready.

so put a 1 mm aluminum shim in this hole.Made sure to make it smooth as not to puncture wax motor.In a pot of boiling water I sit a stock tstat and my shimmed unit side by side.At 90c mod unit starts to open,nothing on stock unit.At 97c modded tstat appears wide open and stock unit not budged.I now have it installed in car and warming up.

Originally Posted by dolfan13

Attachment 366630so put a 1 mm aluminum shim in this hole.Made sure to make it smooth as not to puncture wax motor.In a pot of boiling water I sit a stock tstat and my shimmed unit side by side.At 90c mod unit starts to open,nothing on stock unit.At 97c modded tstat appears wide open and stock unit not budged.I now have it installed in car and warming up.

Any pics of this shim you made?

cruising at 93c.Idling with AC on at 96c on 65f sunny day.I will do a UOA in about 3k more miles to check for unusual engine wear if no faults or other trouble.This car now feels rev happy and I just want to waist gas!!

That's my only worry that my shim will dissolve lol.I cut the round end of a pop rivet off with a rotary tool!LOL.Its aluminum so will not rust and BMW antifreeze is loaded with anti corrosion.I do machine work at a car factory and also a robot tech.Have had 50 cars and many hot rods and BMWs .This is by far not that out there.This is how the C5 vette guys have been doing it.

Dissolve though?
Be sure to report your findings, still waiting to see if sf appears With good news

I just went for a long drive.93c most of the cruise.Up to 96c at stop light.Drove about 45min all ok.After much reading m62 guys modded tstat holder for lower temps on e39 v8s.Very similar engine and I think the only reason for higher temps is emissions and gas mileage.Nothing to do with optimum performance or life of engine.

Originally Posted by dolfan13

I just went for a long drive.93c most of the cruise.Up to 96c at stop light.Drove about 45min all ok.After much reading m62 guys modded tstat holder for lower temps on e39 v8s.Very similar engine and I think the only reason for higher temps is emissions and gas mileage.Nothing to do with optimum performance or life of engine.

Very nice! Hmm I tried shims and didn't see any difference though.

But still coolant pipe is a must first.
I also found the way to install 95c m62 tstat but already waiting for factory 95s.

Hey SFBay what's up.I think I got lucky on the shim.My stock unit was a Whaler?The modded unit is a Beck Arnley if that makes any diff.I tried to shim it the max amout without unseating the valve.

Originally Posted by SFbay

Very nice! Hmm I tried shims and didn't see any difference though.

But still coolant pipe is a must first.
I also found the way to install 95c m62 tstat but already waiting for factory 95s.

Seems as though cm gave up already.
I think it would be worth posting up that info on retrofitting the m62 tstat still. Would be good stuff for public knowledge, and to those who cant DIY, theres the option if a factory 95 while supplies last.
Keep us posted

Just google m62 tstat mod easy search.This is different engine than ours.I just meant to make the point that other 105c engines have been modded to run 95c or less.Early m62 ran at 85c I think so later owners saw this advantage .Dont hold me to any of this ,

Yeah but hes saying he figured a way to fit that tstat to our engine.

Wanted to add I was digging for engine temperature and effects of components.I happened across a VW engineering page discussing the effects of heat damage after engine is shut off and still hot.This research seemed to say this is when valve seals in particular could be damaged .This was on air engines but as I sit here in car after highway drive my shut off temp is 95c instead of 105c.This must help with seal life?