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E34 Loud popping noise under dash



I have a loud popping noise coming from under my dash in the area of the
heater core. It occurs only at Interstate speeds (70-80mph). I suspect that
there may be air in the core that is causing it, but I am far from certain.
Anyone else ever had this problem? Thanks in advance!

Linwood Brooks
[email protected]
1992 525i auto w/ 103K

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