Identify the leak completely and repair accordingly. If the radiator is leaking they are not repairable. If the hose is just loose tighten it or replace it if all the compliance is gone from the rubber. Note the necks fall off those radiators regularly and cook many of the motors in the process don't take a chance replace the thing.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician