It is most likely your radiator neck is cracking therefore leaking. Change
the radiator and hoses while you are at it... It is fairly simple job.
Two clips to release the fan shroud
Two clips to release the radiator.
Cut old big hoses off with razor knife
Loosen tranny fluid line if applicable.
As for tightening... once clamp is taut, turn one or two full turn... you
want tension... not cranking all mighty force on plastic neck. Just some
Never put WD-40 or any oil lubricant on rubber hoses... will cause them to
swell and fail prematuely.
If the leaking occurs on the radiator end of the hose, most likely is
the cracked radiator neck as mentioned by Tiger. The neck is made by
plastic. The cracked neck is very common for MB made around 80s or even
early 90s (at least those are the MB I am familiar with :-). The
replacement radiator should have metal reinforcement inside the neck.
Make sure that is what you get.
Most radiator specialists should be able to replace the plastic tank
(for about $200 for me two years ago). It is an easy job for them. If
you can get decent radiator at good price, go for it.
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