Lloyd,
 
my '85 gives me the same symptoms after interstate travel....I'm still trying to figure out the exact problem this time = around, but in the past it has been a compression leak into the cooling system = either from a bad head gasket(the metal ones on top of the barrels) or a cracked head.
 
Before panicing though, check the main coolant = tank.  If the level is topped up and no hissing comes out when you open it cold = you are probably OK and somehow just overfilled.  If you hear lots of = gurgling and hissing as you open it cold you could have a compression leak that has = charged the cooling system with air and displaced coolant.
 
Mark
 
Hi
My 83 Westy was stored for the = winter.  In april I noticed that the overflow tank appeared empty so I added = some.  This past weekend I took it out and headed for North Conway NH.  = When I returned home after the 300 mile trip the overflow tank was completely = full and coolant was coming out of the top of it.  At the time I was = parked on a slight uphill incline.  The temperature gauge was normal and = the engine did not appear to be overheated.  Does anyone know what the = problem might be?
 
Many thanks, Lloyd Perkins