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Heater Core Bench Test

WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the heater core from the vehicle; see HEATER CORE REMOVAL/INSTALLATION  .
  2. Drain all of the coolant from the heater core.
  3. Connect the 101 mm (4 inch) test heater hoses with plug and adapter to the core tubes. Then connect the radiator/heater core pressure tester to the adapter.
  4. Apply 241 (35 psi) of air pressure to the heater core. Submerge the heater core in water.
  5. If a leak is observed, replace the heater core.
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