For 1990-2009 cars

### Blower Motor

A constant air rush is typical of high-speed blower operation. Some systems and modes may be worse than others. If possible, test another similar vehicle in order to determine whether the noise is typical or excessive. Refer to Noise Diagnosis in Heating, Ventilation and Air Conditioning for the diagnosis of excessive blower noise.

### Compressor

Resonant compressor noises are not a cause for alarm. However, irregular noises or rattles may indicate broken parts or excessive wear.

Excessive noise that comes from the inside of the compressor may be related to one of the following possibilities:

• | A defective piston shoe

• | A defective bearing

• | A defective cylinder

• | A defective shaft

In such cases, replace the compressor assembly. Refer to Air Conditioning Compressor Replacement .

Excessive noise coming from the magnetic clutch face area may be related to a magnetic clutch or defective bearing. Replace the magnetic clutch if the noise comes from the clutch. Refer to Compressor Clutch Coil and/or Pulley Rim . If the noise does not come from the clutch, replace the compressor assembly. Refer to Air Conditioning Compressor Replacement .