Q: Water blowing out tailpipe.

The first thing I would have to ask is if the cooling system is getting low on coolant. Does the engine run rough or misfire? The water coming out of your tail pipe may be just that, water due to normal moisture from the combustion process and no repairs would be needed. Now, if you are getting low on coolant and a misfiring is happening then you may have a blown head gasket. Your mechanic would have to do a test to verify the problem by pressure testing the cooling system to see what cylinder head is leaking coolant into a cylinder. The cylinder heads would have to be removed and the head gaskets or a head is damaged. The intake would also have to be inspected during disassembly to check for a leaking intake manifold.