do you have a clutch fan or direct drive? if clutch, does it still lock up when the engine reaches operating temp? easy way to test would be the next time the car over heats, pull over, shut the engine off, pop the hood and grab the fan and give it a spin. if it spins easily WHILE THE ENGINE IS OVEREHEATED, you've got a problem.
the hose on the vacuum side of the radiator can actually suck shut. you might try replacing that and/or making sure that the support spring hasn't corroded away.
have you tested the water for exh gases? this would indicate that you've had a head gasket burn through. you can buy a kit from any NAPA store.
how old is your radiator? new multi-core radiators will take care of the problem so long as you have water flow. also note that the fluid being clean does NOT mean that the rad core is clean.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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