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Q:

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

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I have a leak under the timing belt cover
(3) Answers
It has a timing chain for both pushrod and DOHC engines! Have system pressure tested to FIND your leak.
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
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