Coolant expansion tank DIY?
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New Members
Joined: Apr 2013
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From: San Francisco
My Ride: E60 545i
Coolant expansion tank DIY?
Is replacing the tank an easy DIY? my local bmw pros want $450 to replace it w/ a bleed. I found out the coolant stick was broken inside the tank.
Senior Members
Joined: Nov 2008
Posts: 670
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From: Houston, TX
My Ride: 2006 530i, Jet Black, Tan, Premium, Steptronic
It isn't hard. The basic steps:
Remove the plastic cover from underneath the car. Drain the radiator using the drain on the radiator. Replace the coolant overflow tank. Refill with a 50/50 mixture of coolant/water. Purge the air from the system. Replace the plastic cover.
See here for more details:
cooling-system-flush-refill-venting-system
You should probably replace the hoses to and from the tank while you're at it.
Remove the plastic cover from underneath the car. Drain the radiator using the drain on the radiator. Replace the coolant overflow tank. Refill with a 50/50 mixture of coolant/water. Purge the air from the system. Replace the plastic cover.
See here for more details:
cooling-system-flush-refill-venting-system
You should probably replace the hoses to and from the tank while you're at it.
Senior Members
Joined: Jan 2011
Posts: 2,348
Likes: 3
From: UpState SC
My Ride: 2008 535i LCI with sports/premium package, Sports trans with paddle shifters, CF emblems, JB4 Software, Dinan Exhaust, Navigation, M5Tech body kit, Carbon wrap interrior trim and CIC Controller.
If you have an electric water pump thn you can activate it using this procedure and it will circulated and remove the air.
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Joined: Jan 2013
Posts: 228
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From: atlanta
My Ride: 2005 545i Sport
Here's my detailed description of when I replaced mine:
https://5series.net/forums/e60-discu...9/#post1488696
https://5series.net/forums/e60-discu...9/#post1488696
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