F 350 4WD Pickup V8-351 5.8L VIN H EFI (1997)
Heater Core: Testing and Inspection
Heater Core Plugged
Make sure the engine coolant is at the proper level, then start the engine and let it run until it is warmed to operating temperature. Turn on the
heater and feel the inlet and outlet heater water hoses to the heater core. If the inlet heater water hose is hot and outlet heater water hose is cooler,
the heater core might be plugged.
To bleed air from heater core, remove the hose at the outlet connection of the heater core (hose leading to the water pump). Allow any trapped air
to flow out. When a continuous flow of coolant is obtained, connect the hose to the core. Do not overtighten heater hose clamps.
NOTE: Make sure an appropriate container is used to collect any coolant that is lost during the heater core bleed procedure.
Heater Core Pressure Test
1. Drain the cooling system.
2. Disconnect the heater water hoses from the heater core. If constant tension clamps are used, be sure they are properly positioned.
3. Install a short piece of heater water hose (approximately 100 mm [4 inches] long) onto each tube of the heater core.
4. Fill the heater core and heater water hoses with water and install Plug BT-7422-B and Adapter BT-7422-A from Radiator/Heater Core
Pressure Tester 014-R1069 or equivalent in the ends of the heater water hoses. Secure the heater water hoses to the heater core, plug and
adapter with clamps.
