Purchased this car 4 months ago with 84K miles, compressor noise was evident at that time but only for about a second after the clutch engaged. Now, at 89K miles, with the compressor running, the noise is occurring during braking, as though there is excess free play in compressor's internal components. A review of the VMI shows warranty AC work at 45K miles but no details are available. Have another '97 E420 with over 115K miles and its compressor is quite at all times.