Knocking/Vibrating noise behind AC vents

Need help identifying what causes the vibrating/knocking sound behind AC vents.

After a mins na AC was turned on, you'll hear the noise, and once pinatay ang AC mawawala din yung noise

TIA

Quote:

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Originally Posted by CoolSwitch

Need help identifying what causes the vibrating/knocking sound behind AC vents.

After a mins na AC was turned on, you'll hear the noise, and once pinatay ang AC mawawala din yung noise

TIA

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might be FOD (foreign object debris) or a thermistor that came loose from the mounting and oscillating. vehicle make, model, year, mileage, last thing done to it prior to the symptoms?

Toyota Corolla 94

last thing done:
-just had the AC cleaned, and hinang daw sa evaporator (may tama daw kaya may tagas)

Ipasilip or ipadinig mo sa gumawa dati baka under warranty pa at wala naman charge.

kung may tagas evaporator mo wala ng freon kinabukasan