I just went threw the same thing as u are. I had limited money... and after shopping around i bought a 1992 Bonneville SE. I paid $1000 for it. And couldnt test drive due to the brake lines being broke. But I "bit the bullet" and bought it. I dont regret it. u dont have many options with little money. Its not like ur gonna be able to purchase a descent car with no issues for under a grand. And since ur dad is a mechanic u might make out well. I ended up putting another $1300 or so into my car but it wasn't all necessary i bought all new SensaTrac struts, SSEI swaybar, 4 new tires, ect, ect,. Electrical issues arent always easy either unless u get lucky and u have a blown fuse or chaffed wires. the a/c doesnt work at all or it doesnt blow cold? if it doesnt work, it could be a fuse or relay, if it doesnt blow cold, check for a sealed system and refill. the window could be a number of reasons. Bad motor, chaffed wires, ect. If u get lucky with all the issues which u prolly wont u can fix all issues for $100 give or take but thats not likely. Just my 2 cents. U can really catch a deal with these older Bonnevilles that need work. I would say take your dad with u and have him look over all the problems to see what he thinks it would take to fix em. Even if u put another $700 into it ur still getting a good deal. And u cant put a price on learning experience.
1992 Bonnie SE, freshly overhauled, 6000k HID'*, SensaTrac Struts, 32mm Tubular SSEI sway bar
Kenwood HU , JL 1000/1, 8W7'*, 15" CVX'*, 18" DC lvl4