Hi. Left for work this morning, car was fine. Stopped for petrol and when I started driving I noticed a strange noise that increased and decreased with the revs. It's like a whining / whistling noise but quite loud. The noise stops if I put the air con into econ mode which makes me think the compressor has had it. The fact that it stops when in econ mode makes me think that the clutch on the compressor is still engaging and disengaging. Anyone else had similar issues?