ME: I would be willing to do it with a notarized contract. If you will promise me you won't back out of a sale and will pay the asking price of $3k, I will also have the radiator replaced tomorrow. It is slow to heat up and I don't want you to have any problems or not have heat in the car. Just had an alignment, everything else is great, and again, if you are sure that you want to buy it I will pay to replace the radiator tomorrow so there are no problems at all. This thing has had pretty much all maintenance that could be needed in the past year other than the radiator.
HER: That sounds amazing. Is there a way we could get the vehicle and sign the contracts and notarize them tomorrow? My husband will be at work all day, but I can use the car during the day time to get that notarized. We would need the vehicle tomorrow if at all possible. And no, I won't back out. You have been very kind and I plan to extend the hand as much as possible also.
ME: Well thank you, I am just not the type of person to sell someone a car that will give them problems right off of the bat

. As for tomorrow, it depends on when I can schedule for the radiator to be put in. It doesn't overheat now or anything, it just doesn't have heat inside. I will call around first thing in the morning and write a contract tonight. I would like to do the $200 as a deposit before replacing the radiator if possible, so I can use that to pay for most of the replacement cost.
HER: Yeah, no problem.
ME: Sounds good. I will write up a contract tonight and will call shops for the radiator first thing in the morning.