Probe V6-153 2.5L DOHC (1994)
2.
Clean the evaporator core tube fittings.
a.
For threaded connections, wipe any dirt or debris from the sealing surfaces with a clean lint-free rag.
b.
If the evaporator core tube fittings are the female Spring Lock design, check the inside of each fitting for scratches, corrosion, or debris from
deteriorated 0-rings.
c.
If scratches, corrosion, or debris are found, the leak test results may not be accurate unless the fitting is properly cleaned. Refer to Step 3 for
cleaning procedure.
3.
Clean the Spring Lock fittings as follows:
a.
Remove any surface residue from the inside of the female Spring Lock Coupling by polishing with 400 grit emery cloth or equivalent.
b.
Polish the female surface by using a twisting motion so that any scratches made will not cross the 0-ring sealing surface. See Figure 1.
c.
Perform additional polishing of surface using 600 grit emery cloth or equivalent.
d.
Remove all residue from the polishing operations by wiping the fittings with a lint-free rag.
e.
Connect the appropriate test fittings from Test Adapter Kit D93L-19703-B, or equivalent, to the evaporator tube connections.
5.
Connect the RED and BLUE hoses from the manifold gauge set to the test fittings on the evaporator core. Connect the YELLOW hose to a known
quality vacuum pump.
NOTE:
THE AUTOMATIC SHUTOFF VALVES ON SOME GAUGE SET HOSES DO NOT OPEN WHEN CONNECTED TO THE TEST FITTINGS.
IF AVAILABLE, USE HOSES WITHOUT SHUTOFF VALVES. IF HOSES WITH SHUTOFF VALVES ARE USED, CHECK TO BE SURE
THE VALVE OPENS WHEN ATTACHED TO THE TEST FITTINGS OR INSTALL AN ADAPTER WHICH WILL ACTIVATE THE VALVE.
THE TEST IS NOT VALID IF THE SHUTOFF VALVE DOES NOT OPEN, ONLY THE HOSE WILL BE TESTED.
6.
Open both gauge set valves and start the vacuum pump.
a.
Turn the A/C system blower on low to allow the vacuum pump to operate for a minimum of 45 minutes after the gauge set low pressure
gauge indicates 30" Hg. The 45 minute evacuation is necessary to remove any refrigerant from oil left in the evaporator core.
b.
If the refrigerant is not completely removed from the oil, outgassing will occur and degrade the vacuum and appear as a refrigerant leak.
7.
If the low pressure gauge reading will not drop to 30" Hg when the valves on the gauge and manifold set are open and the vacuum 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
test fitting connections and gauge set connections before replacing the evaporator core.
8.
The following information is helpful in determining if a leak is present.
