Mustang V8-4.6L (2009)
Heater Core: Testing and Inspection
Heater Core - Pressure Test
Climate Control System
Component Tests
Heater Core - Pressure Test
Use the Radiator/Heater Core Pressure Tester to carry out the pressure test.
1. NOTE: Due to space limitations, a bench test may be necessary for pressure testing.
Clamp off the heater hoses.
2. WARNING: Before disconnecting any heater water hoses, shut OFF the engine and wait until engine is fully cool. Failure to comply with
this warning may result in serious injury or burns from hot liquid escaping from the engine cooling system.
Disconnect the heater water hoses from the heater core.
3. Install a short piece of heater hose, approximately 101 mm (4 in) long on each heater core tube.
4. Fill the heater core and heater hoses with water and install plug BT-7422-B and the adapter BT-7422-A from the Pressure Test Kit. Secure the
heater hoses, plug and adapter with hose clamps.
5. Attach the pump and gauge assembly from the Pressure Test Kit to the adapter.
6. Close the bleed valve at the base of the gauge. Pump 138 kPa (20 psi) of air pressure into the heater core.
7. Observe the pressure gauge for a minimum of 3 minutes.
8. If the pressure drops, check the heater water hose connections to the core tubes for leaks. If the heater water hoses do not leak, remove the heater
core from the vehicle and carry out the bench test. See: Heating and Air Conditioning/Testing and Inspection/Component Tests and General
Diagnostics/Heater Core - Bench Test
