Actually have two questions about a car I recently bought

First bought a 2005 Volvo S60 from a gentleman on Facebook for 2400$ I asked the man before buying if this car has been reliable and well taken care of that I needed it to go back and forth to work. He said yes and that he had receipts from all the work through the years. Well about 3 weeks later I was driving home when my car started acting funny. This is going to be the start of my second complaint well I took the car to a mechanic close to my house because my car was running running hot . My wife took it to him on a Friday he said he would look at it on Monday we said let us know what it is and how much before you start working on it. He said it was the coolant hoses in the engine that needed replaced the cost would be 600$ and also my serpentine belt also needed fixed that would be 230$ I said go ahead and do it well my wife called to give him a credit card number to pay for it he said he only takes cash he never said anything before then also no signs anywhere. Well I was able to get 830$ cash I went and paid Thursday when I went to go pay he didn't take it for a drive after fixing it just let it idle also after paying I asked for a receipt and he didn't have one. Well fri morning I went driving and the car was overheating I immediately turned around and went home I took the car to the shop for him to look at it at the end of the next day he call me and asks me to walk to the shop to show me something and basically tells me that my cylinder head needs replaced or a new engine. But he also says the previous owner must of known something when he went to go sell it. I would like compensation from both the guy I bought the car from and the mechanic