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there are no actuators/valves between the firewall and the heater core. The actual heater core tubes are like 18" long and run all the way through the firewall. I traced the lines and they run back to the engine

Located around cleveland Ohio, bought a used 6.4 last fall, so far she's deleted and studded running a Spartan tuner and a coolant filter after replacing an oil cooler this spring. She's my daily with about 160k. must've been a southern truck cuz she is CLEAN. This seems to be the beginning of...

I have what appears to be a leaking heater core. The wierd thing is that it only leaks when the heat is turned on. Coolant smell from the dash and a fair amount of coolant leaks from teh A/C drain. Turn it to full cold or to off and the leak stops. Not sure when it happened since its been hot...