"Most marginal motorists have performed this dance. For overheating, remove the thermostat; not a wise long-term move, but it will get you home. If the problem is a leaky hose, duct tape (99 cents) will hold for weeks. Got a crack in the plastic ceiling piece? I used a $2.99 fiberglass bond epoxy on my Miata that held for more than a year.
If you have a leaky radiator, Alumaseal is the ticket. "It looks like powdered aluminum and actually works quite well," says Duchene. "It goes to wherever the leak is and when it reaches air, it basically sets up." And at $2.79, it sure beats $130 plus labor for a new radiator."
Hope this helps.
BTW: I think it's almost like begging to explain why you are selling something, and it would probably be better for your auction if you removed that. Coupled with your low rating.