Hello I have a A/C problem with my G500 W463 2004. The A/C is blowing semi warm 1. A/C light permanently on. 2. Refrigerant dryer develops a bubble now and then in the viewing window. 3.The compressor nut is rotating with the clutch assembly. 4. Blower seems very strong. 5. I have noticed the horn is not working unrelated??? 6. Could a switch be stuck open or a relay require replacement? 7. I had new refrigerant and vacuum tested to eliminate from my tick list when first went wrong.