powertrain warranty

I bought the extended powertrain warranty and was hoping that the problems I have now are covered:

something wrong with the ac belt
car overheating, possibly waterpump
I have to refill my coolant every week

A/C belt = no
 
Water pump = maybe
 
It all depents on the warranty company.  They are all different.  Read your warranty contract.  It should tell you or give you a number to call.

If you have to refill the coolant everyweek, you must have a leak, it's going somwhere.  Check your oil, see if it is "frothy" looking.