I have a 98 Volvo V90. The AC blows nice and cool for 15 or 20 minutes sometimes longer than he cuts off. If I shut it off at the dash button then wait a while to come back on. The problem is not with the clutch gap. For some reason I am losing power at the connection to the clutch. I'm not the one working on the car but connections have been checked to make sure they are tight. I'm thinking there may be a problem with a sensor. I'm not really familiar with the sensors on this car and don't know where the problem might be located. Any help would be greatly appreciated