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Heater Core - Bench Test

WARNING: This page is about a different car, the 2003 Mercury Mountaineer and 2003 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the heater core from the vehicle. For additional information, refer to HEATER CORE - FRONT .
  2. Drain all of the coolant from the heater core.
  3. Connect the 101 mm (4 inch) test heater water hoses with plug and adapter to the core tubes. Then connect the Radiator/Heater Core Pressure Tester to the adapter.
  4. Apply 241 kPa (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.
    Fig 1: Identifying Heater Core
    G01271439Courtesy of FORD MOTOR CO.
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