MALFUNCTION JUNCTION AUTOMOTIVE

have a 2021 chevy 3500 6.6 diesel. ac not cooling at times as well. we just replaced the fan clutch because it was weak causing insufficient airflow thru condenser. truck only have 35k on it. dealer could not get to truck till december. ac is now colder than before we replaced the fan clutch but driver states ac cuts out goes hot then ac comes back cold again. i have seen data stating low voltage to ac compressor clutch relay. truck is not modified. only have raptor lights in grille and hooked up to passenger side headlight parking light circuit. anyone have any ideas