You should park your vehicle out of direct sunlight before testing.
- Close the high and low-pressure valve of the gauge manifold.
- Connect the charging hose (blue) to the low-pressure valve and connect the charging hose (red) to the high-pressure valve of the gauge manifold.
Install the quick joint (for low-pressure) to the charging hose (blue), and connect the quick joint (for high-pressure) to the charging hose (red).
WARNINGTo connect the quick joint, press section A firmly against the service valve until a click is heard. When connecting, run your hand along the hose while pressing to ensure that there are no bends in the hose.
Connect the quick joint (for low-pressure) to the low-pressure service valve and connect the quick joint (for high-pressure) to the high-pressure service valve.
NOTEThe high-pressure service valve is on the A/C pipe and the low-pressure service valve is on the suction hose.
- Start the engine.
Set the A/C controls as follows:
A/C switch: A/C - ON position
- Adjust engine speed to 1,500 r/min with A/C clutch engaged.
- Engine should be warmed up with doors and windows closed.
Insert a thermometer in the center air outlet and operate the engine for 20 minutes.
NOTEIf the A/C clutch cycles, take the reading before the clutch disengages.
Note the discharge air temperature and compare with the accompanying chart.