Lloyd11281942

Had a new Dometic rear a/c install on our 201 Montana 3440RL and it only blows air out the vents at 72 degrees and shuts down after a few minutes then comes back on. it never cools down the trailer. Tried setting the thermometer down to 60 degrees making it stay a little longer. Outside temp is 77 degree and inside temp is 82 degrees after running the unit for about 2 hours