2005 X5 OEM Expansion Tank Parts
I am going to take a stab at changing out the expansion tank on my 2005 X5 3.0. Is the OEM expansion tank really that much better? Is there an aftermarket brand made by the same manufacturer? Do I need to change the thermostat on the tank also as good measure? Any help?
I've replaced mine with a Behr expansion tank and had good results. It's at least as reliable as the BMW OEM tank, and costs less as well. Some people will advise sticking with OEM, but since the OEM parts don't last very long anyway, what's the point? LOL
My advice, if you're going to replace the expansion tank, now would be a good time to replace most of the soft parts of the system as well. Hoses, belts, and possibly the coolant level sensor as well. I broke mine the first time I replaced my expansion tank and ended up driving around for a couple of weeks with a low coolant light until my new sensor came in.
ECS Tuning sells some pretty good kits that are pre-assembled with various levels of parts. Or they sell individual pieces if the kits don't meet your needs, wants, or budget constraints.
Hope this helps!
Thansk! this was a Great Help!
What about the thermostat, isnt there one built in the tank? Does iot need replaced?
The thermostat that I think you're referring to is the automatic transmission thermostat. I had forgotten about that, until you reminded me about it again. Sorry about that. Yes, that's something that gets broken fairly frequently when removing and replacing the expansion tank. If you're careful, you can get away without replacing it, but don't be surprised if you break it.
Check out this kit: http://www.ecstuning.com/BMW-E53-X5-...Kit/ES2158107/
It's a Level 2 kit, assembled with aftermarket parts, and replaces most of the troublesome parts.
Add in this part: http://www.ecstuning.com/BMW-E53-X5-...ion/ES2091406/
That's the Automatic transmission thermostat. Not a genuine BMW part but, again, it's budget-conscious.
All of this will cost right around $400 including shipping, and your car will give you major brownie points for taking care of it so well. Plus, you'll get some BMW Merit Badges and gain valuable knowledge. Best of luck!
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