Tambourine Sound

You may have an exhaust rattle that is causing the noise, especially if it only happens when it's cold. The problem is, noises can be quite difficult to find even with the car in the shop, so it's best to have it looked at. It can be related to the A/C problem a well, but an inspection of the car will determine that. Good Luck, let us know what you end up finding!

check the ac compressor and see if it cycles and if the clutch on it engages or not.

A lose fan .