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Heater Core

WARNING: This page is about a different car, the 2001 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check for proper coolant level. Start engine and turn heater on. When engine reaches normal operating temperature, feel heater outlet hose. It should be hot. If hose is not hot, heater core may have an air pocket, heater core may be plugged, or thermostat may not be working properly.
  2. Drain cooling system. Disconnect heater hoses from heater core. Install a short piece of heater hose, about 4" (101 mm) long on each heater core tube. See Fig 1.
  3. Fill heater core and heater hoses with water. Install Plug (BT-7422-B) on one hose end and Adapter (BT-7422-A) on other hose end. See Fig 1. Secure hoses, plug and adapter to hoses with hose clamps.
  4. Attach pump and gauge assembly from a radiator/pressure tester to adapter fitting on heater hose. Close tester bleed valve and apply 35 psi (2.5 kg/cm2 ) air pressure to heater core. Observe gauge for 3 minutes.
  5. If pressure drops, check all hose clamp connections for proper fit; replace leaking hoses or clamps. If hoses do not leak, remove heater core from vehicle.
Fig 1: Hose Fittings For Heater Core Pressure Test
G98B03184Courtesy of FORD MOTOR CO.
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