01 ram 1500 a/c problem=

truck has 172,000 miles on it. v/8 , 2 wheel drive. a/c stopped blowing cold air. friend looked at it and said compressor ok. he thinks it,s something called "a-sensor" under the dash. major labor to get to it. anyone on the forum been under the dash lately to repair a/c ?

possible a leak in the system usually the evap coil