My 2003 HD Max has anti-freeze smell in the cab and the vents seem to be smoking. The truck has only 45,k on it and I'm not happy. Igues the heating core? Thanks, Cas

Sounds like a heater core to me too. Antifreeze fumes in not the best thing in the world to breath all the time so you need to get it fixed soon. In the mean timne leave cap loose or use a lower pressure cap as it will greatly slow leak rate.

bypass heater core, dexcool smell is rank