Sable V6-232 3.8L (1988)
Figure 2
Figure 3
5.
Air pressure test the heater core as described below:
a.
Attach the pump and gauge assembly Rotunda model 021-0012 or equivalent to the adapter, Figure 2.
b.
Close the bleed valve at the base of the gauge.
c.
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 core tubes for leaks. If the hoses do not leak, remove the heater core from the vehicle and
perform the bench air pressure test.
