Put it on the AC diagnostic machine, said Schrader valves were leaking

Went to the dealer, they put it on the ac diagnostic machine, said Schrader valves were leaking. Replaced. Still blowing cold for five minutes then going hot, turn off five minutes then cold again for five min utes repeat. Went back to dealer, back on the diagnostic machine. Now I am told clutch and coil are bad and the condenser fan relay is bad. Can all that go wrong at once and is there a chance one of the problems could cause the other problem? Help before I spend myself into a new car.