Heater core popped. No big deal, easiest repair than you'll ever do on this truck. Disconnect hoses from core in the engine bay. Blow air in one port of core, coolant will come out the other port as core empties partially (this saves the mess on your carpet later). Remove glove box. Remove heater plenum cover behind it. Pull old heater core out. Put new heater core in. Reinstall plenum cover (may have to use a bit of silicone on it if the factory seal tears). Reinstall glove box. Hook up hoses in engine bay. Now is a good time to replace said hoses, they are 5/8" size, buy in bulk by the foot (it's cheaper). Remove rad cap, fire up engine, let run for a few min, adding coolant as needed, reinstall rad cap. Be on your merry way. 22-25 min from start to finish if you're replacing hoses and simply slice old ones w/ razor blade to make 'em let go of the heater core and engine ports.
In the mean time you can bypass the core, yes. Just connect its two hoses together. Blow air thru core to purge most of the coolant.