I replaced everything. Thermostat, water pump, temp sending unit, aluminum coolant bottle, clutch fan, & Radiator. At a stop light at idle the temperature will climb until I put my aux fan on a dash switch. I kick it on when needed - no problems. I would fix the aux fan first. If you still have a problem, get a new radiator and burp the system correctly. I think mine would have been fine with just the new rad & fan fix - HTH Rich