LTD Crown Victoria V8-302 5.0L VIN F FI (1986)
Rotunda 21-0012 Installed For Pressure Test
6. Close the bleed valve at the base of the gauge and pump 207 kPa (30 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 hose connections to the core tubes for leaks. If the hoses do not leak, remove the heater core from the vehicle and
bench test the heater core.
BENCH TEST
1. Drain all coolant from the heater core.
2. Connect the 101.6 mm (4 inch) test hoses with plug and adapter to the core tubes. Then, connect the air pump and gauge assembly to the adapter.
3. Apply 207 kPa (30 psi) of air pressure to the heater core with Rotunda model 21-0012 or equivalent, and submerge the core in water.
4. If a leak is observed, service or replace the heater core as necessary.
