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can you add a coolant sealer into the reserve antifreeze bottle I have a leak on 2002 Mercury Sable

I have a leak under the timing belt cover

Asked by for the 2002 Mercury Sable
It has a timing chain for both pushrod and DOHC engines! Have system pressure tested to FIND your leak.
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2 more answers
never use sealant. get an insp for poss water pump as #1 said
If the leak is under the timing belt cover i would inspect further and make sure it is not coming from the water pump and if so i could recommend replacing the water pump because the sealer will more than likely not help your issue