Help Fix Teresa's Car!

Hello Friends! Our one and only car needs a repair that is not in the budget just now, and we depend on it for work. The mechanic says $800 for a new water pump. I'm sure that will do it for a good while, as we just replaced a few other parts recently. Never put out a call for help like this one, and it feels a little bit weird, but a good friend suggested it, so here we are :-). Thank you in advance for any help received.