1997 Ex repairs

Hi I need advice with a few repairs before I sell my Civic. Its a 1997 Ex with manual transmission.

First, the transmission grinds slightly when I shift into 3rd. If I shift it slowly it won't grind. The clutch is depressed the same as for all other gears. How could I mix it and is it cheaper to swap the transmission if the repair is that nasty or expensive. (I ussually do my own work).

Second, the car was in an accident a few years ago and the body shop replaced the fan (the blower fan inside the car, that blows hot or cold air). The fan is extremely loud and I would like to replace it before I sell it, its a huge turn off from buying the car.

Thanks for the help!