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So lets get serious.
When I have heard a sound that has a gulpy ring it has come from the A/C. My theory is that when you shut off the A/C pump the high and low pressure sides equalize in the evaporator, As the difference in pressure drops you may be able to hear the sound.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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