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Home >> Mazda >> 2001 >> B2300 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Manual A/C-Heater Systems) >> Component Tests >> Heater Core

Heater Core

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  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 not, 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 short piece of heater water hose, about 4 in. (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 proper hose clamps.
  4. Attach pump and gauge assembly from a radiator/heater core 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. Watch 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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