Hello,

Its very hot here in TX right now, so whenever I come home I pop the hood and raise it up to help the engine cool down faster, wait around for about 5 mins, then close it and go inside the home... I cringe at the idea of turning the engine off and letting it raise its temps to 100C without running.....

I noticed one day that my expansion tank was wet near the area where the cap connects to the neck.

I bought a new one and it arrived yesterday... I noticed one key difference...

This new one does not have a connector at the very top of the tank for a cooling connection...

I traced the line that is missing on my new tank... The old tank has it run from the very top of the tank through a rubber hose which connects to a metal hose that runs along the back wall of the engine bay and disappears behind the engine block.

Any help? Did I buy the wrong tank?

Part number is 124 500 17 49

__________________
2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)