On–vehicle inspection

1. 1
   Magnetic clutch control: inspect pressure switch operation.
2. 2
   Set on the manifold gauge set.
3. 3
   Connect the positive (+) lead from the ohmmeter to terminal 4 and the negative (–) lead to terminal 1.
4. 4
   Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration.

If operation is not as specified, replace the pressure switch.

1. 1
   Cooling fan control: inspect pressure switch operation.
2. 2
   Connect the positive (+) lead from the ohmmeter to terminal 2 and the negative (–) lead to terminal 3.
3. 3
   Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration.

If operation is not as specified, replace the pressure switch.

1. 1
   connect the positive (+) lead from the battery to terminal and the negative (–) lead to the body ground.
2. 2
   check that the magnetic clutch energized.

If operation is not as specified, replace the magnet clutch assy.