Bronco L6-300 4.9L VIN Y 1-bbl (1983)
Figure 2
Figure 3 - TOOL 021-00012 WITH HEATER HOSE AND CLAMPS
5.
Attach the pump and gauge assembly Rotunda model 021-00012 or equivalent to the adapter (Figure 2). Close the bleed valve at the base of the
gauge and pump 30 psi of air pressure into the heater core (Figure 3).
6.
Observe the pressure gauge for a minimum of three minutes. The pressure should not drop.
7.
If the pressure does not drop, no leaks are indicated.
8.
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 perform the bench test.
Bench Test
1.
Drain all coolant from the heater core.
Figure 4 - HEATER CORE BENCH TEST
2.
Connect the 4-inch test hoses with plug and adapter to the core tubes. Then connect the air pump and gauge assembly to the adapter (Figure 4).
3.
Apply 30 psi of air pressure to the heater core with Rotunda model 021-00012 or equivalent, and submerge the core in water.
4.
If a leak is observed, service or replace the heater core as necessary.
