Cougar/XR7 V8-4.6L VIN W (1997)
1. Drain the coolant from the cooling system.
NOTE: Due to space limitations, a bench test may be necessary for pressure testing.
2. Disconnect the heater water hoses from the heater core tubes.
3. Install a short piece of heater water hose, approximately 101 mm (4 inches) long on each heater core tube.
4. Fill the heater core and heater water hose with water and install Plug BT-7422-B and adapter BT-7422-A from Rotunda Radiator Pressure
Tester 014-R1072 or equivalent in the heater water hose ends. Secure the heater water hoses, plug and adapter with hose clamps.
5. Attach the pump and gauge assembly from Rotunda Radiator Pressure Tester 014-R1072 or equivalent to the adapter.
6. Close the bleed valve at the base of the gauge and pump 241 kPa (35 psi) of air pressure into the heater core.
7. Observe the pressure gauge for a minimum of three minutes. The pressure should not drop.
8. If the pressure does not drop, no leaks are indicated.
9. 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 perform bench test.
Bench Test
Use Rotunda Radiator Pressure Tester 014-R1072 or equivalent to perform bench test.
1. Drain all coolant from the heater core.
2. Remove heater core from A/C evaporator housing.
3. Connect the 101 mm (4 inch) test heater water hoses with plug and adapter to the core tubes. Then connect the Rotunda Radiator Pressure
Tester 014-R1072 or equivalent 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, service or replace the heater core (as necessary).
6. Install heater core into A/C evaporator housing.
