Did a thermostat replacement today (a lot of pics) - Page 6 - BMW M5 Forum and M6 Forums
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post #51 of 554 Old 27th October 2009, 10:15 PM
TurboCarrera
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The thermostat is a reasonable $39 at Arizona Autohaus. It is a Behr part. autohausaz.com

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post #52 of 554 Old 27th October 2009, 11:39 PM
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Originally Posted by Hdhntr23 View Post
Yes Douglas. It is MANDITORY that if you drain from the block you get new crush washers. That would suck to get the thing drained all the way then only to realize you didnt buy 2 $.60 parts. So while youre buying the MANDITORY OEM coolant ask them for some crush washers for the block.
Much better

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post #53 of 554 Old 28th October 2009, 02:45 AM
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Thanks Doug and Chris. I'll be sure to pick up the crush washers. How soon do you guys think I need to drain this stuff? Should it be an immediate concern?
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post #54 of 554 Old 28th October 2009, 03:25 PM
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Thanks Doug and Chris. I'll be sure to pick up the crush washers. How soon do you guys think I need to drain this stuff? Should it be an immediate concern?

Did you get a premix type? As in 50/50? Or, did you mix your own? If you mixed your own and used tap water I'd say get it out as soon as possible.

If you bought it premixed or you used distilled water I would say yes its a priority but get to it when you have a spare hour or so.

The mineral deposits from tap water will ruin your internals faster than off the shelf anti freeze. I wouldnt wait too long though if you bought off the shelf 50/50 mixed.

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post #55 of 554 Old 28th October 2009, 04:30 PM
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Thanks Doug and Chris. I'll be sure to pick up the crush washers. How soon do you guys think I need to drain this stuff? Should it be an immediate concern?
I'll go with: as soon as possible. The longer you leave it, the greater the risk, but I don't think any severe damage will be done in the short term. I'd say if you get it out in a week or two you'll be fine...

d-
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post #56 of 554 Old 8th November 2009, 01:30 AM
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Thanks for the DIY!
M5 is out in the garage on jack stands right now, ready for the new t-stat install.
Except I think I only bought 4 o-rings, not six, so will see how that goes.
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post #57 of 554 Old 8th November 2009, 01:36 AM
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Replaced on 2 M5s today the thermostats,only the inner metal sealing ring in the housing was a PITA...
Edit:Both don't run original BMW coolant and not even TWS

Last edited by vantaam5; 8th November 2009 at 01:13 PM.
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post #58 of 554 Old 8th November 2009, 09:01 PM
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did the thermostat about a month ago. when putting housing back on I didn't seat the thermo in the housing till after i slid it in place over the water pump. This allowed me to be able to tilt the thermo at an angle to move it in proper place over the pump. once i hade wiggled it over the housing i pushed the thermo in place and now had the 3 pipes completely level to be seated. this will keep you from pinching or knocking an o-ring out of place. just a gentle push and they all popped right in to place. you will feel if they go on right or not. without doing this it looks like it will be a significant angle to push on.


never replaced the inner gasket unless it is trashed not really nec. would highly recommend bmw fluid or another HOAT for an aluminum block and no tap water use purefied. this last one failed in partial position fyi. also fill from the temp switch hole if you can all while squeezing both hoses will keep you from getting an air pocket of needing to bleed.

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post #59 of 554 Old 9th November 2009, 02:43 AM
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Couple of things of note from my replacement:
-Yes, TIS says you don't need to disconnect the VANOS oil lines. But not worth the aggrevation, order up the replacement crush washers (2 ea of #07119963072 and 2 ea of 07119963129) for the banjo bolts and flop the oil lines out of the way, makes it much easier.
-Had to really pull and wiggle to get the housing off, the water pipes did not want to pop out.
-I replaced the inner seal, I'd agree with the previous posts that its probably not necessary, but I had already bought the damn thing. MAJOR PITA to get out.

Should replace your oil seperator drain lines while you have the t-stat housing off. Have to have the t-stat housing off to get at the drain lines, and our engines are old enough now that rubber hoses are starting to deteriate.
#11151407344 and #11151406902 along with the clamps for the bottom end, 2 each of #07129952107

I had to borrow a big socket from a friend to press the new inner seal back into the t-stat housing.
He says the M5 thermostat design is identical to the one Caterpillar has been using on their big diesel engines for the last 20 years or so.
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post #60 of 554 Old 9th November 2009, 05:49 AM
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Inner thermostat gasket.

I finally replaced my thermostat based on this thread and other on this site. It all went well and my temp is now back to 85 C. Thanks to everyone for posting your experiences! It's a great help for someone like me who has not done this type of job before.

Anyone, I will strongly recommend that you don't waste time on replacing the inner seal. I have not seen any good arguments why this needs to be replaced and I have not found anybody who had problems because they didn't replace it. So if it looks fine, just leave it even if you have already bought a new one. Just my 5 cents on this issue...

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