Overheating TR6

[ewcorco@erenj.com]

        Neophytic question: I have a TR6 that started overheating this
weekend - nothing dramatic, but it's typically run reasonably cool up until
now; how do I tell if it's the water pump or just a bad thermostat or
radiator cap?  I know (?) the radiator is fine since the core was replaced
a year ago.  Any and all suggestions appreciated.                    

                        Ned Corcoran