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"The gurgling occurs when the car is shut off....it sounds like water returning into the overflow tank slowly from the vaccuum."
Is this correct, the water is going into the overflow when shut down? If so that means you are overheating and heat soaking badly. That is not vacuum but pressure. You could try a higher pressure cap, but I really don't recommend that for normal street cars.
Don't know if you got the new cap yet and the results.
Everyone, one thing to check on your radiator caps, the bottom piece of rubber, if it is wider in diameter than the metal support it will not allow the engine to suck the coolant back into the motor as the coolant contracts as it cools causing. This is where the vacuum comes in. Pressure from the expanding heated coolant is what pushes the coolant into the overflow.
The radiator cap is a two way valve.
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