Squeal from Engine Compartment (Install Mounting Sleeves to A/C Compressor) (Export)

Some customers may comment on a constant squeal noise coming from the engine compartment, particularly after a cold start, at idle and/or slow acceleration.

The squeal noise should not be confused with a start up "chirp" noise which only occurs during engine cranking.

In addition, the noise is not influenced by the A/C being on or off or alternator load (i.e. high electrical load = high accessory drive load).

It is possible for the A/C compressor pulley to be out of alignment by approximately ½ a belt rib (2mm) relative to the engine crankshaft accessory drive belt pulley.

This means, that on checking with a laser device (refer to "Note" at the end of this bulletin), the A/C compressor pulley will be forward, relative to the crankshaft accessory drive belt pulley. This is caused by excessive clearance between the compressor mounting holes and bolts.

As an interim solution, A/C compressor mounting sleeves (refer to graphic above) have been developed for implementation in production as well as a field fix.

Important: 

After verifying that the vehicle has the condition described above, install mounting sleeves to the A/C compressor using the following procedure.

If required, it may be helpful to refer to the following section is SI (Global Connect) -- Air Conditioning Compressor Replacement-3.6L Engine (document # 1977379).

1. Raise the vehicle on a hoist to gain access to the A/C compressor.
2. Remove the three bolts holding the A/C compressor into the bracket and angle the compressor slightly forward towards the front of the vehicle so the sleeves, 2 only, can be inserted. The following diagram and photo are to illustrate the location of the three bolts only.





3. The sleeves are to be inserted on the mating side of the A/C compressor to the bracket - the two bolts closest to the front of the vehicle (bolts numbered 1 and 2 only as above).



4. Insert the sleeves using the following procedure:




4.1.	Sit the sleeve insert over the bolt hole.





4.2.	Push the sleeve insert into the bolt hole (a few gentle taps may be required).





4.3.	Ensure the sleeve insert is fully seated so that it is not protruding above the bracket mounting face.

5. Re-install the A/C compressor to the bracket.
6. If belt squeal is still present after installation of the sleeves, check alignment of the accessory belt drive to confirm if any other part of the system is the cause.

Note: A "Drivealign Laser Tool" from Gates Australia (p/n 91006), or any similar type of laser type belt alignment checking tool, is advantageous for conducting quick and accurate alignment of the accessory drive belt system.

For vehicles repaired under warranty, use: