Ranger 2WD V6-245 4.0L VIN X SFI (1997)
Heater Core: Testing and Inspection
Bench Test
BENCH TEST
1. Drain all coolant from the heater core.
2. Connect the 101.6 mm (4 in) test heater water hoses with plug and adapter to the core tubes. Then connect Rotunda Radiator/Heater Core Pressure
Tester or equivalent to the adapter.
3. Apply 206 kPa (30 psi) of air pressure to the heater core with Rotunda Radiator/Heater Core Pressure Tester or equivalent and submerge the
heater core in water.
4. If a leak is observed, repair or replace the heater core as necessary.
