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Built My Way's Avatar DIY Water Pump & Thermostat Replacement (2007 335i w/Automatic Transmission)
Built My Way
12-23-2012
DIY Water Pump & Thermostat Replacement (2007 335i w/Automatic Transmission) NOTE: This DIY may be used on other 335i model years and on xi models as well (part numbers may differ).

UPDATE (Feb 16, 2014): BavAuto has put together a great video of the procedure which can...
  #154  
By ska325xi on 03-22-2014, 02:54 PM
OP, can you add the two videos from youtube (few post above) to your first page diy?

Not to take credit from you but It might help others with some visuals.
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  #155  
By nukezero on 03-22-2014, 03:27 PM
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2 hours 21 mins later, I finally got the water pump and thermostat out. This includes intercooler and fan removal. Those plastic connectors are a BITCH. 3rd 12-pt star screw at the top was also inconvenient. But atlast, it's all out.

I followed BarvarianAuto's video and found it to be very accurate. I still could not fathom how the thermostat could have come out first because to disconnect those hoses, the entire water pump is in your way. This is with me lying on my back. It also helps to have the fan removed but not necessary, it just gives you room to work with.


Taking a lunch break and going to go and put it back in. I took out the intercooler to examine blow-by. It seems there is some oil in there (5 oz) and also some blow-by near the charge-pipe diver-valve. Oil seems to be seeping out a little.

85k miles and no major problems with the car ever. So I'm not sure if this oil blow-by problem is a big problem. Also, noticed that oil pan gasket is starting to have some oil seep as well. The oil pan gasket will probably last me another 20-25k miles tops.

Ah... money money money down this car. 4 more car payments left and I will own this car outright. 5-yr bmw financing.
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  #156  
By Built My Way on 03-22-2014, 04:08 PM
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Quote:
Originally Posted by ska325xi View Post
OP, can you add the two videos from youtube (few post above) to your first page diy?

Not to take credit from you but It might help others with some visuals.
Totally agree with you. I'll get them up ASAP. Thanks
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  #157  
By nukezero on 03-22-2014, 09:30 PM
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Want to bring up the issue with the 32mm and 26mm water pump bolts.

Tisher sent me both bolts for the new continental water pump. Upon comparison with the old pump, the 32mm does seem longer when it is inserted into the pump. However, based on Bavarian Auto's install video, he used all three 32mm for the Continental water pump!!????

But I was actually able to use only two 32mm in the front, and the hidden water pump bolt, I had to use the 26mm because I could tell it would have bottomed out if I used the 32mm.

So I don't know how Bavarian Auto was able to use 32mm for the 3rd water pump bolt at the top... if you watch his video, he does this. Also, I thought the 26mm was a bit short because when I compared it to the threads of the old water pump with 32mm, it just seemed a bit short.
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  #158  
By PichaDis11 on 03-23-2014, 05:16 AM
Quote:
Originally Posted by Built My Way
Quote:
Originally Posted by nukezero View Post
the original post says the thermostat must come out first, however the bavarian video says the water pump must come out first, then the thermostat.

based on what i see, it would sound like the water pump should come out first after disconnecting the hoses and such. I don't see how the thermostat could come out first without any room.
Having a hoist would have made all the difference (ie; better lines of sight and manoeuvrability/leverage) but for me, the order of steps in my DIY just seemed natural. They were based on what I could and couldnt do at a given moment while working in a cramped space.

I decided that I could get better purchase on the thermostat hoses (especially the two, hard to remove spring type plastic connections) while the thermostat was still secured to the pump. Then by removing the thermostat before dropping the pump, I was able to create a void which allowed me to see better the upper pump bolt and the discharge hose clamp. I suppose I could have tried harder to get to the upper pump bolt with the thermostat still in place. But then again I really didnt have any problem slipping the thermostat out between the fan housing and vehicle frame.

Its always good to know that theres more than one way to skin a cat. I hope that anyone doing the install will read through the procedure, watch the video and decide on what route might be best for them based on their working environment.
Well said.

I did this today and it was a painful 5hrs to get out. Yes and I have the N52. I had to get creative with a bunch of tightening the thermostat off and on to get a couple hoses first to clear space for getting to the third WP bolt. In my case I ended taking the Waterpump out first as the coolant reservoir line connection at the thermostat was not budging.

Thanks again for the write up on DIY.
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  #159  
By Built My Way on 03-23-2014, 05:52 AM
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Quote:
Originally Posted by nukezero View Post
Want to bring up the issue with the 32mm and 26mm water pump bolts.

Tisher sent me both bolts for the new continental water pump. Upon comparison with the old pump, the 32mm does seem longer when it is inserted into the pump. However, based on Bavarian Auto's install video, he used all three 32mm for the Continental water pump!!????

But I was actually able to use only two 32mm in the front, and the hidden water pump bolt, I had to use the 26mm because I could tell it would have bottomed out if I used the 32mm.

So I don't know how Bavarian Auto was able to use 32mm for the 3rd water pump bolt at the top... if you watch his video, he does this. Also, I thought the 26mm was a bit short because when I compared it to the threads of the old water pump with 32mm, it just seemed a bit short.
There's a comment from an e90post member that I put in with the DIY preamble whereby he used two 32mm bolts (lower bolting) and recommends cutting an 1/8" off the third (top bolting) so it won't bottom out. I used the 26mm bolts without any problem.

If you look closely, the number on the bag in the Bav Auto vid checks out. They did use 32mm and there's no mention of using a shorter bolt for the third. Looks like he fed the bolt in by touch only and doesn't visually inspect it when it's been tightened. I'll bet anything that their third bolt did bottom out.
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  #160  
By ska325xi on 03-23-2014, 11:34 AM
Maybe they have a 5 series or x3 that all 3 bolts are the same???
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  #161  
By Gmby99 on 03-24-2014, 10:47 AM
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I actually just finished changing the thermostat and water pump this past weekend, it's definitely doable, although as everybody mentioned that 3rd bolt holding the water pump is a pain in the ss to reach.

Ended up doing this procedure twice bc I hadn't connected one of the hoses properly, the small quick disconnect one, and so had a noticeable amount of coolant leaking.

1st time it took me 6 hrs, 2nd time 1.5 hrs.



Does anybody know where I can get that metal clip for the quick disconnect hose, as I was trying to install the hose the ciip jumped and I have no idea where it went.
So I used the clip from the hose leading into the coolant reservoir and secured that one with metal wire until I find a replacement.

Any ideas?
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  #162  
By ska325xi on 03-24-2014, 12:05 PM
Quote:
Originally Posted by Gmby99
I actually just finished changing the thermostat and water pump this past weekend, it's definitely doable, although as everybody mentioned that 3rd bolt holding the water pump is a pain in the ss to reach.

Ended up doing this procedure twice bc I hadn't connected one of the hoses properly, the small quick disconnect one, and so had a noticeable amount of coolant leaking.

1st time it took me 6 hrs, 2nd time 1.5 hrs.



Does anybody know where I can get that metal clip for the quick disconnect hose, as I was trying to install the hose the ciip jumped and I have no idea where it went.
So I used the clip from the hose leading into the coolant reservoir and secured that one with metal wire until I find a replacement.

Any ideas?
If its just a hose clip they have in at your local auto stores (autozone, adv auto, etc)
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  #163  
By Gmby99 on 03-24-2014, 02:50 PM
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Quote:
Originally Posted by ska325xi View Post
If its just a hose clip they have in at your local auto stores (autozone, adv auto, etc)

I tried, they don't have them.

Im trying to look it up online under quick disconnect metal clip
but no luck.
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  #164  
By ska325xi on 03-24-2014, 02:57 PM
They are call Hose Clamp
Go steal one from your friends car lol


http://<a href="http://<a href="http...0Clamp</a></a>


Also check ECS
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  #165  
By Gmby99 on 03-24-2014, 03:20 PM
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Quote:
Originally Posted by ska325xi View Post
They are call Hose Clamp
Go steal one from your friends car lol


http://<a href="http://<a href="http...0Clamp</a></a>


Also check ECS

I looked under clamp but it gives me the metal clamps that you turn the nut to tighten.

here's a link to a photo I found for the
clip im missing. Its that metal u-shape clip at the bottom.


http://www.bimmerfest.com/forums/att...1&d=1280728027
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  #166  
By ska325xi on 03-24-2014, 03:41 PM
Quote:
Originally Posted by Gmby99
Quote:
Originally Posted by ska325xi View Post
They are call Hose Clamp
Go steal one from your friends car lol


http://<a href="http://<a href="http...0Clamp</a></a>


Also check ECS

I looked under clamp but it gives me the metal clamps that you turn the nut to tighten.

here's a link to a photo I found for the
clip im missing. Its that metal u-shape clip at the bottom.


http://www.bimmerfest.com/forums/att...1&d=1280728027
Oh those grenade clips...those you might need to go to your dealer
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  #167  
By Built My Way on 03-24-2014, 05:16 PM
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Quote:
Originally Posted by Gmby99 View Post
I looked under clamp but it gives me the metal clamps that you turn the nut to tighten.

here's a link to a photo I found for the
clip im missing. Its that metal u-shape clip at the bottom.


http://www.bimmerfest.com/forums/att...1&d=1280728027
Maybe this is what you are looking for.

http://www.ebay.com/itm/BMW-COOLANT-...7fe70a&vxp=mtr
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  #168  
By Gmby99 on 03-25-2014, 12:34 AM
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Quote:
Originally Posted by Built My Way View Post
Maybe this is what you are looking for.

http://www.ebay.com/itm/BMW-COOLANT-...7fe70a&vxp=mtr

That's the one!

although $5 seems a bit excessive for one of those things, but I need it so can't complain.


Thanks
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  #169  
By N88888_dawg on 04-16-2014, 06:37 AM
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is replacing the thermostat really necessary?
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  #170  
By Built My Way on 04-16-2014, 12:22 PM
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Quote:
Originally Posted by N88888_dawg View Post
is replacing the thermostat really necessary?
It's up to you but you might as well get 'er done while everything's apart under there. Consider it preventive maintenance and it's cheaper in the long run.
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  #171  
By Jklad on 04-16-2014, 07:27 PM
Quote:
Originally Posted by N88888_dawg
is replacing the thermostat really necessary?
Not if you don't mind getting up close and personal with your car and its fluids allover again for half a day! Just do it!
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  #172  
By N88888_dawg on 04-17-2014, 12:56 AM
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Quote:
Originally Posted by Jklad View Post
Not if you don't mind getting up close and personal with your car and its fluids allover again for half a day! Just do it!
Ooooo. That actually sounds quite enjoyable
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