Rotating Torque Check

WARNING:
^ R134A IS CLASSIFIED AS A SAFE REFRIGERANT, BUT MISUSE CAN MAKE IT DANGEROUS. THE FOLLOWING PRECAUTIONS MUST BE OBSERVED.
^ ALWAYS WEAR SAFETY GOGGLES WHEN SERVICING AN AIR CONDITIONING SYSTEM.
^ AVOID CONTACT WITH LIQUID REFRIGERANT R134A. R134A VAPORIZES AT APPROXIMATELY -20°F UNDER ATMOSPHERIC PRESSURE AND IT WILL FREEZE SKIN TISSUE.
^ NEVER ALLOW REFRIGERANT R134A GAS TO ESCAPE IN QUANTITY IN AN OCCUPIED SPACE. R134A IS NON-TOXIC, BUT IT IS A HEAVIER THAN AIR GAS THAT WILL DISPLACE OXYGEN. THIS CAN CAUSE SUFFOCATION.
^ NEVER USE A TORCH IN AN ATMOSPHERE CONTAINING R134A GAS. R134A IS NON-TOXIC AT ALL NORMAL CONDITIONS, BUT WHEN IT IS EXPOSED TO HIGH TEMPERATURES, SUCH AS A TORCH FLAME, IT DECOMPOSES. ONE OF THE PRODUCTS OF THE CHEMICAL BREAKDOWN IS A PHOSGENE GAS WHICH IS HIGHLY TOXIC.
^ CARE MUST BE EXERCISED SO AS NOT TO HEAT ANY PORTION OF THE CHARGED AIR CONDITIONING SYSTEM TOO HOT. THE PRESSURE IN AN AIR CONDITIONING SYSTEM RISES AS THE TEMPERATURE RISES AND TEMPERATURES OF APPROXIMATELY 200°F CAN BE DANGEROUS.

The rotational torque of an A/C compressor should be checked if excessive A/C compressor drag is suspected.

NOTE: It may be necessary to remove the A/C compressor from the vehicle to perform this test.

1. Discharge the A/C system.
2. Remove the A/C manifold and tube.
3. With the A/C clutch disengaged, rotate the compressor shaft one complete revolution and note the torque required to rotate the compressor shaft a second revolution.
4. If the rotational torque exceeds 13 Nm (9 lb/ft) replace the A/C compressor.
5. Install the A/C manifold and tube.
6. Recharge the A/C system.