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Pressure Test (On Vehicle)

WARNING: This page is about a different car, the 2002 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. Drain cooling system. Disconnect heater hoses from heater core. Install a short piece of heater water hose, about 4" (101 mm) long, on each heater core tube. See Fig 1.
  2. 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.
  3. 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. Observe gauge for a minimum of 3 minutes.
  4. 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 and perform bench test. See PRESSURE TEST (BENCH) .
Fig 1: Hose Fittings For Heater Core Pressure Test
G98B03184Courtesy of FORD MOTOR CO.
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