Turn temp dial up and down a few times. Ours did same but started working.
I believe you can clamp one of the pipes running up the back of the cab to stop hot water flowing but that might be the previous design.
Quick test - run engine til hot, turn on ac, slow fan speed. Wait 5 mins or so, feel heater hoses back of engine above starter. If one is freezing cold, your heater valve is not shutting off.
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