Ranger 4WD V6-3.0L VIN U (1997)
Heater Core: Testing and Inspection
Plugged Heater Core Test
PLUGGED HEATER CORE
Check to 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, feel the inlet and outlet heater water hose connected to the heater core. If the inlet heater water hose is hot and outlet heater water hose
is cooler, the heater core may be plugged.
