Hi, I have an after market fit A/C system on my Disco 1(already on vehicle when i bought it) It is an excellent fit as it looks standard, made by Factair UK. As i hadnt used it for some time, i recently turned it on. After about 30 seconds the compressor clutch decides to engage / disengage intermittently until it got to a stage where it is literally 'chattering'! I had the system recharged by an aircon 'expert'. they didnt notice it happening, i suspect they didnt even run it for long after recharging. They have said they think the compressor is a fault. Anyone any ideas. Could it have semi -seized, or is there a relay that may be at fault?