N: Noise While Operating Climate Control System

Pinpoint Test N: Noise While Operating Climate Control System

N1 Check A/C Compressor
- Run the engine at a constant 3000-4000 rpm.
- Alternately switch the A/C compressor ON and OFF by turning the A/C system ON and OFF.
Does the noise disappear?
Yes
If the system was recently recharged, A/C compressor is OK.
Otherwise, PERFORM the Refrigerant System Tests in Component Testing.
No
GO to N2.

N2 Recheck A/C Compressor.
- Turn engine OFF and let sit for 1-2 minutes.
- Run the engine on hold speed at 3000-4000 rpm.
- Cylce the A/C compressor as in Pinpoint Test N1.
Does the noise appear?
Yes
PERFORM the A/C Compressor component test.
No
REPLACE the A/C Compressor.