Disconnect the heater hoses from the engine and crank engine over the one that spits out coolant is your inlet to the heater core-
April, 22, 2012 AT 2:15 AM
Well, unlike my jimmy. I see 2 hose that come from firewall. Then they have 3 way tees with both ends going back into firewall. Presumbly, to evaporator. The parts of tee's for both line go all the way down to underbody supposing going to back of car. Is there a way can tell if engine is running one hot or cold. Etc?
P.S this is 1997 ford expedition 5.4L 2wd. Both heater hose look like pic attached to this response