Some of the aluminum cores had copper fitted pipes. The soldered them together and they leaked like crazy. All Mercedes cores are made of aluminum because of its great heat transfer rate.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM