Gets up to operating temp. fine, cooling fans come on, everything seem ok, then on cool down upper hose collapses at some point, there is no external leaks, and holds pressure with a tester.
Pressure cap is stuck shut. Change it before it blows up a hose.
Replace radiator cap
SOURCE: cooling system problem
try running it to running temp and try to check the heater core hoses. if one is hotter then other may have pluged up heater core.
SOURCE: 2002 V.W. Jetta 2.0 liter overheat
sounds like your water pump is going out. are the hoses building up pressure. i had this problem on my jetta diesel and it was the water pump.
SOURCE: 2003 Pontiac Grand Prix SE 6 Cyl - Cooling Fan Not Operating
the fan motor could just be bad, you can test this by removing the fan and connecting a wire to each terminal and to a battery. the wires hooked up one way will spin the fan and the other way will spin the fan backwards so you cant hook it up wrong. I hope that helps you out!
SOURCE: 2006 Forenza. Over heating problem.
take the overflow hose loose from the resovoir and stick it down in pop bottle with water about half full
and run vehicle if you see bubbles in it you have a bad head gasket.
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it also has a new coolant resevoir and cap.
Check your hose to the overflow. A blockage here will cause that to happen
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