The heater core in my bronco finally blew. Coolant all over the passenger side floor.mwhat a flipping mess. Got it cleaned up, bypassed the core for a week and finally installed a new core. After driving this thing for 3 years with no heat (yes, in the winter time too), it finally started to spill out heat. Sure is nice to have it now. Total repair time, 1 1/2 hours. 30 minutes fr the core and an hour to drain the radiator and refill with new coolant. BRING ON WINTER!!