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      08-18-2014, 12:15 PM   #1
lagwagon
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DIY: Thermostat & Waterpump (Video)

Disregard the intro. We were tired and I was mocking those rather common & extremely uninformed shadetree DIYs. Hopefully this isn't going to be one of them

Couple of notes about the job:
This is for an 08 so check with realoem to make sure the parts match up if you have a newer model

Parts Needed:
11537836155x1 THERMOSTAT
11517838201x1 WATERPUMP
11531406249x2 O-RING (for thermostat housing connection pipes, optional but recommended)
1x BMW Blue coolant gallon
1x Distilled water gallon

Mistakes in video
The two chrome caps that are on the top of the plenum don't do anything. Don't bother removing them

Oil separators do not need to be loosened but it doesn't hurt anything to loosen them. When/if I have to do this again I will leave those in. Just a heads up.

Be CAREFUL with your intake boot when removing the hose. If you are unlucky like me the job will take half an hour longer while you wait for epoxy to dry on the breather hose male end on the boot.

Here's the video:


Thanks to the video uploader for doing the bulk of my work for me and letting me use some shop space to shoot the video.
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      08-18-2014, 12:33 PM   #2
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Very nice DIY. Thanks for that!
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      08-18-2014, 12:38 PM   #3
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At about what mileage is this job recommended? 100k?

Solid DIY btw.

Last edited by lsmkr01; 08-18-2014 at 12:53 PM.
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      08-18-2014, 12:44 PM   #4
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Quote:
Originally Posted by lsmkr01 View Post
At about what mileage is this job recommended? 100k?
I'd say so. It's not like the E36 where there are plastic parts everywhere. The thermostat housing and water pump impellers are made out of metal, so you should be OK.
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      08-18-2014, 12:55 PM   #5
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Quote:
Originally Posted by W/// View Post
I'd say so. It's not like the E36 where there are plastic parts everywhere. The thermostat housing and water pump impellers are made out of metal, so you should be OK.
The pump he pulled looked pretty good besides the O-ring and he said that car has over 120k miles. Good to know the parts are robust on the S65. The impeller looks plastic on the video but you could be either way look like they age well.
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      08-18-2014, 01:11 PM   #6
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The impeller is composite and everything was in very good shape with the exception of my thermostat which looked like junk. Even the o-rings on the connection tubes were still really good and made an audible seal when pressing the housing back on.

I have 120k miles and got the increased emissions CEL ( P0128 ) which is related to the t-stat and decided to just knock out the water pump at the same time.. because.. well, its a BMW.

Last edited by lagwagon; 08-18-2014 at 01:21 PM.
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      08-18-2014, 04:51 PM   #7
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Awesome video sir thanks a lot .can u specify what kind of torque lb needed in some of those bolts on water pump
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      08-18-2014, 05:58 PM   #8
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Nice video. I just completed the thermostat repair last weekend. Not sure why you removed the coil covers on both sides or loosened the reservoir as those items don't affect thermostat or water pump replacement.

Also good time to drain the radiator and replace as much coolant as you can.
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      08-18-2014, 09:23 PM   #9
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Quote:
Originally Posted by VictorH View Post
Nice video. I just completed the thermostat repair last weekend. Not sure why you removed the coil covers on both sides or loosened the reservoir as those items don't affect thermostat or water pump
Believe it or not those steps save you time because they make everything slightly more accessible

Last edited by lagwagon; 08-18-2014 at 09:53 PM.
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      08-18-2014, 09:53 PM   #10
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Quote:
Originally Posted by kninjak View Post
Awesome video sir thanks a lot .can u specify what kind of torque lb needed in some of those bolts on water pump
We just made them hand snug. Didn't torque them down. They will never be an issue
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