can you add a coolant sealer into the reserve antifreeze bottle I have a 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

never use sealant. get an insp for poss water pump as #1 said

It has a timing chain for both pushrod and DOHC engines! Have system pressure tested to FIND your leak.