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thanks guys, i appreciate it.

the thermostat houseing always has a little mess of antifreez so idk if its leaking threw the houseing gasket or the holes. but even though, i dont think it will cause my truck to blow out hot air then cold

ok i will try that, and no i havent tried any leak stop because my radiator is 5 months old

thank for replying guys, but i put coolant every morning (just takes a little bit) and it still the same issue. i even changed the temperture sensor switch and the heater/ac door actuator. Can it be that the thermostat is staying open or the heater core ?

I have a 06 explorer 4.0 v6 in the morning i leave my car to warm up and when i get in it, its blowing cold air. Once its warm, and im driving, it'll blow hot air for a bit and then dies out and blows cold air. When i turn off the blower and turn it back on it does the same thing (blows out hot...