Brief history, I have a 1.9TDI Sport Ghia Galaxy on a 53 plate. Air con stops working, took car to Ford dealer who says the air con pump is U/s. Have local mechanic fit new pump, getr system re filled at ATS, all looks ok, no leaks. With the air con switched on the pump (clutch) is going on and off all the time so I have no cold air coming through. Any herlp and adsvice would really be appreciated. Thanks.