My 1998 Coachman, Class C

[Pat]

AC quit, discovered a fuse melted. Put in New one and unit did not respond. Your advise appreciated.
MsPat

[Rich Thomas]

As you describe the melt down of the fuse I would say a direct short. Pull the fuses and open the AC cover. More than likely you will find the problem as a melted fuse indicates a very high current like you would have if a power wire went straight to ground. Maybe a few over winter guest found a tasty morsel in the insulation on a wire harness. Good luck and keep us up dated. There are a few really good electrical folks on here and they love a challenge.

[Lakota Wolf]

I have come across a/c compressors going out and drawing current enough to melt a wire or fuse block connection. When you replace an a/c compressor and add the R-134 and turn a/c on high and the compressor doesnt want to engage,, the problem is the pressure valve on the compressor line not opening due to a zero reverse pressure,, To rectify this,, unplug compressor,, run 2 wires, with small aligator clips, one for hot one for negative,, you will know when its right when the clutch on the a/c compressor engages.  restart engine,, turn a/c on,, fan on high and connect and add your R134 till correct pressure is achieved,

(New freon (R134 cans have a built in guage)., disconnect the 2 wires and replug in your a/c compressor plug and it should re-engage the compressor.

Rich did make an excellent comment about the little rodent visitors possibly snacking on some of the wires..

[Pat]

Thanks, ac working now.... On RV trip in Alabama. Last major issue, stepped out of Blue, and steps pulled completely away from RV.... Blessed with brother and brother n law that re-configured...now welded in place.