My 98 Cadillac Catera is overheating!?

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Mar 18, 2009
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Here is what happens. When I first turn the car on and start driving, my engine will start to overheat. When I stop the car and turn it off I get under the hood and open my radiator cap. Now when I open the cap it sounds like it forces the coolant through its system like a valve or pump isn't working. Then when I screw the cap back on it runs fine. Anyone know what this might be?
 
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