Isn't my car dealer at fault?

So recently i've financed my first car with my parent being the co signer. I got a 2001 Honda Civic with 188,000 miles. I don't know much about cars but i knew that it was old and had a lot of mileage but at the time i needed a car to have transportation to school which i live 30 minutes from. (lets call him Jim) I gave jim a down payment of $1,200 within 2 weeks i started having trouble with the car. It started to run hot. I took it to him and he said that my timing change and water pump was bad. I have to pay half of the expenses $200 it was in the document agreement that i pay 50/50 of what expenses cost. Today my dad calls and tell me that the car is runing hot and he is stranded. My 30 day warranty which jim is responsible for fixing the car is over on the 2 i was suppose to go up to the dealship this morning to let him fix everything again but the car is runing hot there's no way i can drive 30 minutes to deliver his car. So they are closed for the weekend and i will have to deliver it on monday the 2. So am I entitled to get another car because they keep telling me they will fix the civic but things are still deteriorating on it or do they have to give me my deposit back because i don't want to have to take this to court. EXTRA INFO: jim always tries to get smart with my dad and it seems like he doesn't want to give me another car or my money back i just want to be able to back my dad up.

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