Hey hows it going. I have a 2001 F150 with the 4.6L V8. The heater is not working correctly. After the truck warms up i turn the heater on and it gets warm for about 20 seconds then cools off. I have replaced the thermostat, flushed the radiator and heater core and its still not doing anything im at a loss and could really use some help. Anything would help. Thanks.

 

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