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Heater Core Pressure Test

Use a radiator/heater core pressure tester to perform the pressure test.

NOTE:
  • Due to space limitations, a bench test may be necessary for pressure testing
  1. Drain the coolant from the cooling system; see ENGINE COOLANT REPLACEMENT - 2.3L , ENGINE COOLANT REPLACEMENT - 3.0L or ENGINE COOLANT REPLACEMENT - 4.0L .
  2. Disconnect the heater hoses from the heater core; See HEATER HOSE REMOVAL/INSTALLATION .
  3. Install a short piece of heater hose, approximately 101 mm (4 inches) long on each heater core tube.
  4. Fill the heater core and heater hoses with water and install the radiator/heater core pressure tester at the heater water hose ends. Secure the heater hoses, plug and tester adapter with hose clamps.
    Fig 1: Securing Heater Hoses, Plug And Tester Adapter With Hose Clamps - With Torque Specification
    G03730752Courtesy of MAZDA MOTORS CORP.
  5. Attach the pump and gauge assembly from the pressure tester to the tester adapter.
  6. Close the bleed valve at the base of the gauge. Pump 241 kPa (35 psi) of air pressure into the heater core.
  7. Observe the pressure gauge for a minimum of three minutes.
  8. If the pressure drops, check heater hose connections to the core tubes for leaks. If the heater hoses do not leak, remove the heater core from the vehicle and perform the bench test.
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