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E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

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  #1  
Old 07-25-2011, 02:54 PM
KenTenn KenTenn is offline
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Z4M - Cooling Issue

Just added about 1 liter of distilled water to expansion tank on my 2006 M Roadster (62k miles). I haven't seen any sign of leaks, but that seems like a lot of water to add. Any thoughts?
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  #2  
Old 07-25-2011, 05:02 PM
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thekurgan thekurgan is offline
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Did you get an alert or just checking the cold reservoir routinely?
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  #3  
Old 07-25-2011, 06:28 PM
KenTenn KenTenn is offline
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The amber warning light would come on occassionally for a couple of minutes and then go off once the engine ran for a short time.
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  #4  
Old 07-26-2011, 10:12 AM
KenTenn KenTenn is offline
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Well...finally found capacity for cooling system (10.7L) so adding 1 L is about 10%. Not too bad considering I probably haven't checked it in 2 years...I need to flush anyway, but I wanted to make sure I didn't have a leak BEFORE I put new coolant in.

I am thinking about putting the heavy duty water pump, thermostat and a new reservoir tank on. Is that overkill?
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  #5  
Old 07-26-2011, 10:51 AM
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thekurgan thekurgan is offline
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Quote:
Originally Posted by KenTenn View Post
Well...finally found capacity for cooling system (10.7L) so adding 1 L is about 10%. Not too bad considering I probably haven't checked it in 2 years...I need to flush anyway, but I wanted to make sure I didn't have a leak BEFORE I put new coolant in.

I am thinking about putting the heavy duty water pump, thermostat and a new reservoir tank on. Is that overkill?
I don't think there is a better pump/thermostat for the S54; it's not like the older, non-M engines where the Stewart is THE pump to have. Reservoir tank should be fine, were you looking for a larger one? The one upgrade I wouldn't mine having are silicone hoses.
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  #6  
Old 07-26-2011, 01:05 PM
KenTenn KenTenn is offline
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I thought that the water pumps were only good for about 60k miles and that the Stewart was the pump of choice. Also thought there were a number of premature expansion tank failures so it was best to replace before it failed. Am I confused again...?
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  #7  
Old 07-26-2011, 01:27 PM
dougmcintyre dougmcintyre is offline
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Quote:
Originally Posted by KenTenn View Post
I thought that the water pumps were only good for about 60k miles and that the Stewart was the pump of choice. Also thought there were a number of premature expansion tank failures so it was best to replace before it failed. Am I confused again...?
Well, here's a report of a Z4's expansion tank cracking - http://www.bimmerfest.com/forums/sho...d.php?t=406792

Which would you rather risk? Unnecessarily replacing expansion tanks or a cooling failure.

Last edited by dougmcintyre; 07-26-2011 at 01:40 PM.
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  #8  
Old 07-27-2011, 10:38 PM
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jsc jsc is offline
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Quote:
Originally Posted by dougmcintyre View Post
Well, here's a report of a Z4's expansion tank cracking - http://www.bimmerfest.com/forums/sho...d.php?t=406792

Which would you rather risk? Unnecessarily replacing expansion tanks or a cooling failure.
Z4Ms use a completely different remote expansion tank that is more substantial than the radiator attached one on the Z4. The Z4 ones are the same design as the problematic E46 ones, the Z4M ones are not.
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  #9  
Old 07-28-2011, 07:23 AM
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Ron Stygar Ron Stygar is offline
19,585 Miles
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Quote:
Originally Posted by KenTenn View Post
I thought that the water pumps were only good for about 60k miles and that the Stewart was the pump of choice. Also thought there were a number of premature expansion tank failures so it was best to replace before it failed. Am I confused again...?
RMFD Water pump $468.45 retail.

It may last since it doesn't have a fan on it.
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  #10  
Old 07-28-2011, 07:48 AM
chickdr chickdr is offline
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$468 for a water pump? This seems obscenely expensive....
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  #11  
Old 07-28-2011, 10:08 PM
KenTenn KenTenn is offline
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Ron: I found the Stewart for $195. Will it work? If so, is it a good choice?
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  #12  
Old 07-28-2011, 10:34 PM
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Ron Stygar Ron Stygar is offline
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Originally Posted by KenTenn View Post
Ron: I found the Stewart for $195. Will it work? If so, is it a good choice?
I didn't thing they had one for S54.
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  #13  
Old 07-29-2011, 08:32 AM
KenTenn KenTenn is offline
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Quote:
Originally Posted by Ron Stygar View Post
I didn't thing they had one for S54.
I think you are correct. Just took another look at their site and didn't see S54.
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