Serpentine belts are thinner and more flexible than V-belts. They run cooler and last longer, but they cost about twice as much to replace. Anything less would be an incomplete brake job. Brake components that should be replaced will obviously depend upon the age, milage and wear. It s a judgment call.
Pressure test the cape to check it out.
Use a cleaner, then reverse flush system to clean it out. A badly clogged radiator may need to be rodded out or replaced.