HEATER BLOWS HOT WHEN FIRST TURNED ON THEN STARTS BLOWING COLD HOW CAN I FIX THE on 1999 Ford Expedition

PROBLEM WITH MY 1999 FORD EXPEDITION

2 answers
you will need your heater core flushed out - its common on the fords
agree with danger dave or you have a blend door issue and heater is switching off. fords are greta for having binding blend doors or broken and malfunctioning