Coolant Expansion Tank Leak
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MBWorld Fanatic!
Joined: Nov 2001
Posts: 6,340
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From: Southern California, USA
2003 CL55 AMG
Coolant Expansion Tank Leak
FYI, saw a leak under my car the other day. Thought it may be a dreaded ABC leak but it turned out to be the coolant expansion tank.
After 114,000 mile the tank developed a lengthy crack which started to very slowly leak.
Additionally I found that one of the top vent stubs had broken as well. The line was being held in by the metal sleeve that is in each line so upon the clamp doing its job the plastic is not crushed.
Luckily my local dealer had one in stock. I bought it and replaced it in 15 minutes.
MSRP is $94.00 on this piece and comes with a new flud level sensor. The radiator cap and rubber mounting pieces must be taken off the old part and swapped over. Part # A2205000149
After 114,000 mile the tank developed a lengthy crack which started to very slowly leak.
Additionally I found that one of the top vent stubs had broken as well. The line was being held in by the metal sleeve that is in each line so upon the clamp doing its job the plastic is not crushed.
Luckily my local dealer had one in stock. I bought it and replaced it in 15 minutes.
MSRP is $94.00 on this piece and comes with a new flud level sensor. The radiator cap and rubber mounting pieces must be taken off the old part and swapped over. Part # A2205000149
Last edited by awiner; May 20, 2012 at 11:31 PM.
MBWorld Fanatic!
Joined: Jun 2004
Posts: 1,140
Likes: 2
From: Ashburn, VA
2004 C32, 2006 Honda CBR1000RR, 2007 Harley NightRod, 2013 Harley Road Glide Custom
Just ran across this post. I have the exact same problem and looking online for the parts. I prefer OEM, so just looking for the lowest price, then order this week.
My car hit 100k when I noticed the issue. Odd thing is, the dealer pressure tested the system and did not see it.
Bob
My car hit 100k when I noticed the issue. Odd thing is, the dealer pressure tested the system and did not see it.
Bob
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