Mustang V6-3.8L VIN 4 (1998)
pump is operating, close the gauge set valves and observe the low pressure gauge. If the pressure rises rapidly to zero, a large leak is indicated.
Recheck the fittings and repeat the test before replacing the A/C evaporator core or A/C condenser core.
^
If the low pressure gauge reading rises 34 or more kPa (10 or more in-Hg) of vacuum from the 101 kPa (30 in-Hg) position in 10
minutes, a leak is indicated.
^
If a very small leak is suspected, wait 30 minutes and observe the vacuum gauge.
^
If a small amount of vacuum is lost, operate the vacuum pump with gauge valves open or an additional 30 minutes with the system blower
on low to remove any remaining refrigerant from the oil in the A/C evaporator core or A/C condenser core. Then, recheck for loss of
vacuum.
^
If a very small leak is suspected, allow the system to set overnight with vacuum applied and check for vacuum loss.
9. If the A/C evaporator core or A/C condenser core does leak, as verified by the above procedure, install a new A/C evaporator core or A/C
condenser core.
