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E63 / E64 6 Series (2003 - 2013)
The E63/E64 BMW 6 Series builds on BMW's sporty heritage with aggressive lines and an incredible motor to back the design up. Available in coupe and convertible trims with a standard 4.8 liter engine producing 360 horsepower and 360 lb-ft of torque, the 6-series is a popular choice that exceeds expectations.

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  #1  
Old 04-18-2011, 01:45 PM
alex_645ci alex_645ci is offline
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Talking Newly registered & 645ci Thermostat replacement

Hey Guys,

I am actually not so new to this forum, I have been reading it for about 2 years now... I made my decision 2 years ago to buy a 6 series based off what each and every one of you has posted. I have never been part of any forums but it seems that this one stands out as it has friendly, informative, and educated people - so today I finally registered!

Enough flattery though I have a little issue with my just-out-of-warranty 6-er. I have to replace the thermostat on it (got the famous high emissions) and since I have done it several times on other types of cars, I was thinking it shouldn't be too hard on this one.

What do you guys think? Has anyone attempted this before?


Thanks in advance for all your help!

Last edited by alex_645ci; 04-18-2011 at 01:58 PM.
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  #2  
Old 04-18-2011, 03:46 PM
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TxTaz TxTaz is offline
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Not a problem. You need a 1/4" 10mm and some patience. The back bolt is a bit tricky. Three bolts hold it together. A ratchet 10mm box end is nice to have and a very common size. You might want to invest in one if you haven't already.
And to state the obvious, unplug it first.
Change your coolant while your at it. You will spill a gallon doing the job. It is very straight forward to do.
Welcome to being active on the 6 forum. Enjoy the car.
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  #3  
Old 04-18-2011, 07:27 PM
alex_645ci alex_645ci is offline
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Thanks a lot Taz! Glad to see someone replied! Is there any particular type of coolant you would recommend?
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  #4  
Old 04-18-2011, 09:09 PM
lc1412 lc1412 is offline
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Quote:
Originally Posted by alex_645ci View Post
Thanks a lot Taz! Glad to see someone replied! Is there any particular type of coolant you would recommend?
Welcome to the forums. Go to the stealership for the coolant
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  #5  
Old 04-18-2011, 09:31 PM
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Yorgi Yorgi is offline
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Quote:
Originally Posted by lc1412 View Post
Welcome to the forums. Go to the stealership for the coolant
+1

BMW coolant is nitrite and phosphate free which prevents corrosion and "goo" from forming in the cooling system. The OEM coolant also has a low pH and very good anti-corrosion inhibitors. There is nothing out there that comes close.

Considering how much rads cost and how rarely you need to change coolant I would stick to OEM BMW coolant.
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  #6  
Old 04-19-2011, 05:06 AM
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TxTaz TxTaz is offline
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Originally Posted by Yorgi View Post
Considering how much rads cost and how rarely you need to change coolant I would stick to OEM BMW coolant.
Good advice.

Also the coolant is blue which is nice. I was in Tennessee getting gas and noticed some coolant on the right front tire and fender. I was a little worried until I saw it was green. I hit a puddle of someone elses coolant.
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  #7  
Old 04-19-2011, 07:22 PM
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pablo645 pablo645 is offline
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Welcome to the forum Alex. You are in the right place. Great members here willing to help.
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  #8  
Old 04-20-2011, 07:45 AM
alex_645ci alex_645ci is offline
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Thanks for all the replies! Great info, seems to be the same as with the other cars...

When I change out the coolant, what's the best way to bring it to level? I know that with older cars I worked on in college, all I had to do is just poor some directly into the radiator and run it to let the air bubbles out... Should I just use the reservoir here since there are so many electronics involved?
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  #9  
Old 05-22-2011, 07:13 PM
Black645 Black645 is offline
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New member also going to replace thermostat

Great information I will use in replacing thermostat in my 645Ci. Do you put on any gasket sealer
or anything in addtion to the seal that comes with the thermostat? Same question for the bolts on reinstall. What is a good procedure on total flush of the system? I did a search but didn't find any info.

Thanks
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  #10  
Old 05-22-2011, 07:56 PM
JPEG23 JPEG23 is offline
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Thermostat probably isn't going to fix high emissions warning, get it scanned, and see what it throws before you do anything


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  #11  
Old 05-22-2011, 08:07 PM
Black645 Black645 is offline
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Quote:
Originally Posted by JPEG23 View Post
Thermostat probably isn't going to fix high emissions warning, get it scanned, and see what it throws before you do anything


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I did a scan and the code indicated a stuck open thermostat. Also noticed engine took a long time to heat up. So ordered thermostat and going to install but need to know if need to add
anything else to seal other than the gasket.
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  #12  
Old 05-22-2011, 09:37 PM
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Yorgi Yorgi is offline
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Here is the link for the TIS instructions on changing the thermostat..

There is no mention of using gasket sealant so it's not required. The TIS does include gasket sealant for the valve cover gaskets instructions so BMW includes sealant when necessary.
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  #13  
Old 05-22-2011, 11:00 PM
Black645 Black645 is offline
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Thanks Yorgi for the link and info. I will probably do a flush at the same time.

Also great job on the DIY info for brake replacement. I now feel confident to do that task as it is coming up.
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  #14  
Old 05-25-2011, 08:56 AM
alex_645ci alex_645ci is offline
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I did the work about 2 weeks ago... it was the same issue - open thermostat. the seal comes as part of the assembly. it was really easy work and didn't take me long at all. I also drained the old coolant and replaced it with new since I was already working on this.
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  #15  
Old 05-26-2011, 12:18 PM
Black645 Black645 is offline
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I ordered and received the thermostat. Seal included. Nice to know that it is a relatively easy procedure. Thanks
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  #16  
Old 02-10-2012, 03:02 PM
lajih lajih is offline
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I bought Thermostat and Coolant from dealer today. Is the gallon enough to replace all the coolant that is removed using the drain plug under radiator? Is the BMW coolant concentration proper as purchased, or do I have to mix with distilled water? Is there a filling procedure after installing thermostat? Any help is appreciated. Don't want to mess around with $40/gallon coolant.

Thanks.
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  #17  
Old 02-10-2012, 03:03 PM
lajih lajih is offline
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Quote:
Originally Posted by alex_645ci View Post
I did the work about 2 weeks ago... it was the same issue - open thermostat. the seal comes as part of the assembly. it was really easy work and didn't take me long at all. I also drained the old coolant and replaced it with new since I was already working on this.
I bought Thermostat and Coolant from dealer today. Is the gallon enough to replace all the coolant that is removed using the drain plug under radiator? Is the BMW coolant concentration proper as purchased, or do I have to mix with distilled water? Is there a filling procedure after installing thermostat? Any help is appreciated. Don't want to mess around with $40/gallon coolant.

Thanks.
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  #18  
Old 02-10-2012, 07:59 PM
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Yorgi Yorgi is offline
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You need two gallons and you mix it 50/50.

Here is the link for instructions on draining the system.

The link for changing the thermostat is above.

These are the filling instructions
.
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Straight lines are for fast cars...turns are for fast drivers
'04 M3 - track
'06 650i Cab - daily driver
'02 Highlander - kid hauler
'01 330Ci - winter beater

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  #19  
Old 02-13-2012, 04:43 PM
lajih lajih is offline
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Thank you for quick reply. It was easy work except the hidden screw on the Thermostat. My hands and arms are all scratched up but it was worth the work.
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  #20  
Old 12-15-2012, 07:20 PM
AJoc AJoc is offline
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Anyone have any tips on getting the back bolt out the thermostat? Are you all going from the top or bottom? do I need a knuckle for this or something? I'm struggling!
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  #21  
Old 12-15-2012, 09:49 PM
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DBLAZE DBLAZE is offline
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Just remove the host and the sensor connector first, then the last bolt is super easy to get to... Be sure you have something ready to catch all of the coolant that will come out when you remove the hose.
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  #22  
Old 12-19-2012, 07:12 AM
telecop38 telecop38 is offline
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Yorgi,

the links above don't work anymore...Can you send me the links?

thanks
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  #23  
Old 12-19-2012, 02:25 PM
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645/333 645/333 is offline
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spaghetti coder no longer does BMW, guess people will have to buy the discs??
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  #24  
Old 12-20-2012, 08:09 PM
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Yorgi Yorgi is offline
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Quote:
Originally Posted by 645/333 View Post
spaghetti coder no longer does BMW, guess people will have to buy the discs??
WOW... Say it ain't so. I cannot believe spaghetti coder has taken down the BMW TIS after all these years. BMW must have threatened to sue them.

That is VERY annoying. I can't imagine how many links to various spaghetti coder pages I've posted, probably hundreds. I think I will take screenshots from my local copy of the TIS and post them up where I can. The main problem is bimmerfest removes the ability to edit your posts after 2 months.
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Straight lines are for fast cars...turns are for fast drivers
'04 M3 - track
'06 650i Cab - daily driver
'02 Highlander - kid hauler
'01 330Ci - winter beater

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  #25  
Old 05-12-2013, 07:50 PM
MDC650i MDC650i is offline
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Mein Auto: 650i Convertible
THERMO & HID 650i INSTALL INSTRUCTIONS

HI All - MDC Here, Thanks for all the help - you didn't know you had given me
I have learned an enormous amount by reading your content - THANK YOU
I do feel I can be a contributor going forward

For the immediate I need to replace my THERMOSTAT on my 2006 650i Blk/Blk Convert
Just bought BMW Coolant and STANT Thermo on Amazon
AND Replace my HID Low Beam Driver-side
Just grabbed some PIAA Super Cobalt replacements as well
Seems pretty strate forward - Anything to look out for?

I have upgraded the Fogs and LED Halos
So I'm fairly familiar with the vicinity - Details always help tho!

The links on the forum from previous similar request are now inactive
Will someone assist with Install Guides - Please?
Thank You in Advance!! I know you guys treat each other like family here ..
Looking forward to getting involved more - MDC650i
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