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yeah the flap is working properly, and the heater core is heating up. It is an aluminum heatercore. It was on there when we baught the truck. Should we take it back and buy a copper one?

yeah we have done the same exact things.. shecked everything under the dash, and still nothing jumps out. i jsut dont ge thow some trucks will drive you out of the cab because its too hot, and others (such as ours) will hardly melt away the morning frost. Its a real PITA! The heater hoses are...

yup when we first got the truck we replaced the t-stat adn still no heat.. so we baught another t-stat thinking the first one was bad, but they both work ed properly and the fan clutch is also working properly. I'm wondering if the army has different heater cores for different climates.. we did...

Ok, i have no heat and idk what to do. We have tried everything. The heater core is clean, i have taken it off and blown through it, no problems there. The radiator is clean. I plugged the radiator where the heater hose comes out and on the water pump installed a 45 degree threaded hose fitting...