Same thing here. Quoted over $1000 for a new compressor. Thanks to this forum I was made aware of the clutch gap problem. Found a Volvo only repair shop and for well less than $50 it was fixed and has been working for two years without fail. This site is unbelievable for understanding our strange but wonderful cars.As stated, sounds like your clutch gap is beyond the limits and it is becoming difficult to reengage when hot. Volvo sells shim kits, but you probably just need to remove the shims that are in there.