We have a 2014 Subaru Forrester whose AC Compressor clutch operation is unlike other cars I've ever owned. The video linked is from when the car is cold and AC is engaged. It appears that the clutch is slipping for the first few seconds, but the loud buzzing and noise accompanying engagement remain until warm. The clutch engages fully once warm as well.
According to the dealership this is all normal and refuse to replace the compressor until it completely fails and don't care that the noise makes the vehicle sound like a junker. Careless; considering a slipping clutch will eventually lead to bearing failure, a break of the serpentine belt, and overheating of the engine leaving us stranded.
I know that others have had this fixed under warranty, so I'm wondering how to have this repaired without voiding the warranty by bringing it to a shop other than the dealership. Perhaps another dealership is my only option?
Edit: After visiting the dealer to pick up the car and debating things with the tech who reviewed the operation, he claimed that this vehicle's compressor clutch needs to warm up to engage fully, and again the buzzing is normal until warm. My question would be, what magnetic clutch which is properly gapped, needs to have its friction surfaces heated before it'll catch completely? As far as I'm aware, the clutch is either engaged fully, or disengaged fully. There is no gradual application of pressure. If this was normal operation, would it not be expected to occur every time, and not intermittently depending upon engine, pulley and, ambient temperatures?
I can only guess the buzzing noise is a symptom of the slippage.
I believe I'm being lead on, but would like a professional to weigh in.