A/C - A/C Compressor Squeaking Noises

Bulletin No: 07-001/11

Last Issued: 03/04/2011

Subject:
SQUEAK NOISE FROM A/C COMPRESSOR

APPLICABLE MODEL(S)/VINS
2010-2011 Mazda3 vehicles (including Mazdaspeed3)
with VINS lower than JM1BL******367236 (produced before July 27, 2010).

DESCRIPTION

Some vehicles may exhibit a squeak noise from the magnetic clutch of the A/C compressor. The noise occurs every time the magnetic clutch engages, and is caused by insufficient engagement force between the pressure plate and the A/C compressor pulley. To correct the problem, the design of the pressure plate has been changed.

Customers having this concern should have their vehicle repaired using the following repair procedure.

REPAIR PROCEDURE

1. Verify customer concern.

2. Raise the vehicle.

3. Remove the undercover.

4. Remove the A/C compressor cover (A) - 2.5L (LF) only.





5. Lower the vehicle.

6. After the vehicle is identified, select the following items from the initialization screen on the M-MDS to lock the A/C pressure plate.

a. Select "Data Logger."

b. Select "Modules."

c. Select "PCM."

d. Select "ACCS" from the simulation items in the PID table.

e. Turn on "A/C Relay."

7. Remove the bolt (A) from the A/C pressure plate (B), then turn off the "A/C Relay" with the M-MDS.





8. Replace the A/C pressure plate with a modified one.

Tightening torque: 15 N.m (1.5 kgf.m, 11 ft.lbf)

NOTE:
When tightening the bolt on the A/C pressure plate, turn on the "A/C Relay" with the M-MDS.

9. Measure the clearance around the entire circumference between the pressure plate (A) and the A/C compressor pulley (B) using a thickness gauge (C).





Clearance: 0.35-0.65 mm (0.014-0.025 in)





If not within specification: Remove the pressure plate and adjust the clearance by changing the shim or number of shims (A).

10. Install the removed parts.

11. Verify repair.





PART(S) INFORMATION





WARRANTY INFORMATION

NOTE:
^ This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.

^ This repair will be covered under Mazda's New Vehicle Limited Warranty term.

^ Additional diagnostic time cannot be claimed for this repair.