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      08-18-2014, 01:15 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, 01:33 PM   #2
W///
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Very nice DIY. Thanks for that!
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      08-18-2014, 01:38 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 01:53 PM.
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      08-18-2014, 01:44 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, 01:55 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, 02:11 PM   #6
lagwagon
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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 02:21 PM.
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      08-18-2014, 05:51 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, 06:58 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, 10:23 PM   #9
lagwagon
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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 10:53 PM.
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      08-18-2014, 10:53 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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      08-07-2015, 11:18 AM   #11
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Great DIY! Thank you.
I just replaced the water pump and thermostat on my '08 because of a check engine light and a stop at Advance for a free code read.
The code actually said that there was a difference between what the temperature was and what was expected, and the thermostat needed to be replaced.
Code P0128, btw.
I ordered the Cooling System Refresh Kit from ECS tuning, part ES#2777070 because I wanted to replace the hoses while I was replacing the thermostat.

Couple of things that I learned:
1. You don't need to replace the expansion tank and cap, I read where previous generations of M3 had expansion tank cracking issues, but my 80k mile e90 looked great
2. ECS "recommends" a coolant evacuation tool (part 2712734) for $95. I wasn't impressed. The grommets supplied in the kit didn't create a solid seal with the expansion tank, I wound up getting a gallon of 50/50 into the system, running the engine with the heater on high until the car was hot, then letting it cool down and adding the second gallon by hand.
3. When replacing the hoses, remember that they are "keyed", do not twist to remove them from the radiator! Let me tell you, they were a pita to remove from the radiator. Especially because the radiator neck material appears to be the same material the hose connections are made of. You could as easily break the radiator connections as the hose connections.
3. You will need a 1/4 hose clamp to replace the one you will have to break off of the overflow tube on the old radiator upper hose.
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      08-31-2015, 10:33 AM   #12
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Thanks for the nice DIY instruction! I just replaced my thermostat over the weekend and it was a breeze. Now my car warms up much faster :-).

I didn't replace all the coolant though. I added in Hyperlube (or Water Wetter, your pick) and distilled water to replenish the lost coolant during the process.
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