Sorry to hijack this thread but I have a weird ticking/clicking noise coming from my dash vents and I was hoping someone might know what the cause may be.

It's only on with the vents are on and when the AC is On. Also when I slow down and apply the brakes, the noise is constant and the ticking is more rapid.

This problem started to occur when my aux fan stopped working and when I noticed that I have a coolant leak somewhere.

Any suggestions?

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2005 BMW X5 3.0i
2013 BMW M3 Competition