Need some help on this, I'm starting to wonder if these "little things" are all related. About a month ago I started hearing a weird sort of whistle noise coming from behind dash. You can't hear it outside the truck only when sitting inside. Started out to be just first thing in the morning and then it would go away after a few minutes. Lately it seems to do this longer and longer. Stops when you accelerate. Then I started getting an issue when starting the truck back up after short trips. Seemed like it needed to turn over more. Now today the A/C started blowing warm air. Sounds like the compressor is trying to kick but can't, just keeps trying. Any ideas? Where to start?