Heater box replacement

Heater core

Sorry !!!!!
Got a 2001 gmc 1500 Sierra, heater not working blows
But no heat. One heater hose is hot but the other is not,
Trying to diagnose Problem, heater door sounds like it moves
When temp dial turned. Any thaught's ???
 
one heater hose hot one not try swaping the hose and drive to see if your heat works. Most of the time just reverseing the flow will let it flow.
 


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