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Gurgling and Boiling when shut down on hot days

894 Views 6 Replies 6 Participants Last post by  mjs182004, 
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My 93 fleetwood has 200+ thousand miles on it. When I stop after short drive on hot day it sounds like it is boing and gurgling? I see no fluid loss under vehicle or anywhere. My reservoir fills normally when running and goes back to radiator when cooled. I took cap off and ran with heater on and it boiled up and over a little. I can see the fluid in radiator bubbling with cap off. The cap "looks ok"?? Am I in trouble? help!!:bigroll::bigroll::bigroll:
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One of my recent tool purchases is a radiator pressure tester. If you're boiling over but not overheating yet, I think that means you have low pressure in the coolant system because of a leak somewhere. The lower the pressure in the coolant system, the lower the boil over temp. You'll have to find where the leak is.
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