Although not as bothersome as a poscessed horn, my issue is probably costing me a bit more in gas money. The A/C on my 1997 GMC Yukon 5.7L is running all the time, even when it is shut off. This started happening last year at which point I disconnected it. Just for the heck of it, I plugged it back in earlier this year, it seemed to be ok until the last week or so. Now it's running all the time again regardless of being turned on or off. I haven't done any maint on the A/C ever, the truck has 225000 miles on it. Thoughts? Thanks.