No, NOT the cabin air filter. Just to the right of the steering column in the light grey area of the dash are four horizontal slits. They are about 1 inch below the line where the dark grey and the light grey part of the dash meet. I'm told there is a "cabin air sensor" behind those slits and that is the probable cause that the compressor clutch only engages intermittently. And that it can only be accessed by removing a major portion of the dash/and/or pad. even to check for proper readings.