My AC (manual) has stopped working. I have checked the following: 1. Relay (K19) - checks out fine. 2. All related fuses (cabin & engine compartment) - all good. 3. Clutch and refrigerant fine. Fan relay good. So - my AC button sometimes flashes, sometimes is solid, but compressor not engaging. I jumped the K19 relay (ground wire) and AC engages and blows cold and rad fan comes on fine. I could leave the jumper in place, but really don't want the air conditioning on all the time. Not sure what to check next. Any suggestions?