Heater Core - Pressure Test
WARNING: This page is about a different car, the 2006 Mercury Milan, 2006 Lincoln Zephyr, and 2006 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
Use the Pressure Test Kit to carry out the pressure test.
- Drain the coolant from the cooling system.
- Disconnect the heater hoses from the heater core.
- Install a short piece of heater hose, approximately 101 mm (4 in) long on each heater core tube.
- Fill the heater core and heater hoses with water and install the 2 plugs BT-7422-B and the adapter BT-7422-A from the Pressure Test Kit. Secure the heater hoses, plug and adapter with hose clamps.
- Attach the pump and gauge assembly from the Pressure Test Kit to the adapter.
- Close the bleed valve at the base of the gauge. Pump 138 kPa (20 psi) of air pressure into the heater core.
- Observe the pressure gauge for a minimum of 3 minutes.
- If the pressure drops, check the heater hose connections to the core tubes for leaks. If the heater hoses do not leak, remove the heater core from the vehicle and carry out the bench test.
NOTE:
Due to space limitations, a bench test may be necessary for pressure testing.