It will go into reverse but it just revs and doesn't go anywhere. No problems driving just won't reverse, advise please!!

My car was leaking water onto the ground and overheating within the first few minutes of running. I was told to replace the water pump/timing belt so I did. It was still leaking water and the mechanic found a hold in one of the lines and patched it. It is still running hot and the mechanic says its a problem with the pressure and I need to replace the head gasket. Does that sound right? Is there any way around it?

I have two questions. i am needing my cv boot changed on the driver front wheel..how much is that going to cost and what do i need to do to get that replaced. Also, i have noticed my engine will shut off when i put the care in park after about a minute. I have no idea what the problem could be. I need opinions before i take it to get fixed.

How much labor time is required to replace the power steering pump? 1994 audi cab

check engine light on and off