Did you unplug the fans to make sure it wasn't them?
I see yout point, not worth puting $4500 into a car worth 4k in good running order; especially when you don't need or want it anymore; but your asking someone else to put that same money into a car they just paid $1000 for. Its definitely not worth it to them to invest $5500 into it. Realistically, imo, sell it for 5-6 hundred and be done with it. You could donate it for more but then you can only deduct it if you itemize and then it would only lower what you made. Your actuall tax will only change a little. Its like going from a taxable amount of 15k down to 13.5k which would get you less than $250 extra back.
98 SSEi 111,222 miles.
Intense PCM, LS6 Valve springs, PEMS, FWI. Hawk Street Pads.