Its likely you have air in you cooling system, if its overheating that quickly. If it was low on coolant for any amount of time, it could have caused air to enter the system. I would start by replacing the expansion tank, then fill the system with coolant. On the 617 its necessary to fill through the upper radiator hose first(disconnected at the radiator) and then top it off through the tank. I'm not sure if this applies to the 603, but it couldn't hurt.
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'83 300D 198,000mi Howard
'03 Saturn Vue CVT 75,000mi(wifeys)
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