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The 2 reasons I've experienced for this are:
Not enough coolant in radiator
Thermostat not working correctly (most common), also don't think that the car not overheating means thermostat is ok, on this model there is a bypass built into thermostat, if anything the engine will run below normal temp, BTW a great idea WTG Pontiac !

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βˆ™ 15y ago
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Q: Why does upper hose collapse on Pontiac grand prix?
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