Join Date: Dec 2012
Location: Lafayette, Indiana
Bronco Info: 91 Bronco w/ 5.0 L V8, Auto w/ E40D
There should be a line coming off the thermostat housing going into the heater core. That line carries water into the heater. The other carries it out. There should only be two water lines coming out of your heater. If both lines are hot, your heater core is good. If the line coming off the thermostat is hot, or at least significatly hotter than the other line, then your heater core is blocked.
Better yet, just go to your parts store, buy a new thermostat, thermostat housing gasket, and high temp gasket silicone and replace the thermostat. Make sure you buy the high temp thermostat. The 195* degree one I believe.
PS, drain the water out of your radiator using the pet-cock on the bottom of it before you take the thermostat housing off. And make sure you drain it into a clean tub so you can reuse it. You may want to get some rubber hose to fit on the pet-cock so you can avoid a mess. Do NOT USE allow oil to mix with your coolant if you plan on reusing it.
1991 Bronco w/ 5.0L V8, Auto w/ E40D trans, factory spare tire rack, factory limited slip diff, dual batteries, custom air intake, 8K lb. winch, tactical seat covers, drop down TV w/ CD/DVD player, 31's on stock suspension, roof baskets, new injectors, rear bumper w/ tire rack, 33" Goodyear Wranglers, 2" suspension lift.
To Do List: paint,
My BKO build: Project Farmhand
Last edited by AFBronco235; 01-27-2013 at 11:25 PM.
Reason: Wrong Temp