2003 Dodge Ram Van 3500 Questions

All 2003 Dodge Ram Van 3500 Questions

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I only have two speeds off and high when I turn on the heat or A/C
i have a 2003 dodge 3500 van 5.9 won't start. codes po 340, po 645 and po 523 come up. I just gave it a mini tune up plugs and it ran for a day. now i changed cam postioning sensor still no avail. I just prayed starte...
2003 dodge w/ 5.9 cummins. oil leaks from crankcase breather where it goes into valve cover. It has new breather and o ring. Has 385000 miles very well maintained. No problems with performance runs good no lack of pow...
I hear a hi pitched whine when I accelerate WITH THE AIR CONDITIONING ON, then rises in pitch and fades in volume. It stops when I turn AC off. What are the most likely culprits? Thanks a million