Every time I go over a bump a hear a whistle type sound coming from the air vents - almost like a chirp. When I turn the air cond. off I no longer get the whistle/chirp sound going over small bumps in the road. Any ideas? Valves in the AC? AC works normally (finally).

Thanks

Mark E.
Ft. Lauderale

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Mark E.
Miami, FL
2 X 1997 C280