1989 Ford F250 Heater Core

Fig. 20 Disassembled view of heater case

1.Allow engine to cool and release pressure from system, then disconnect heater hoses from heater core tubes, and plug hoses. 2.Working in passenger compartment, remove glove compartment assembly. 3.Remove seven screws attaching the heater core access cover to plenum chamber. 4.Disconnect vacuum lines, then remove the cover with the vacuum harness attached. 5.Remove heater core from vehicle, Fig. 20. 6.Reverse procedure to install. https://www.2carpros.com/kpages/auto_repair_manuals_alldata.htm