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REPAIR INFORMATION:
CATEGORY: U Heat & A/C
SYMPTOMS: 000 All Symptom Codes
TYPE DESC.: Bulletin
SVC BULLETIN #: U-002/97

REFERENCE#: 2216
SUBJECT: Rattling/Buzzing Noise During A/C Operation

MODEL
YEARS
AFFECTED VIN RANGE
MODEL SPECS
MX3
1994-1995
R0000001-S0999999
With A/C

NOTE:
This bulletin replaces the previously issued bulletin Cat. U 010/96.
A rattling or buzzing noise may be heard from the engine compartment while operating the A/C. This noise may be caused by refrigerant pulsating from the compressor causing the pressure switch to vibrate against the engine compartment bulkhead. To eliminate the noise, the expansion valve has been modified. Customers complaining of this noise should have the vehicle inspected and if necessary, repaired according to the bulletin.

REPAIR PROCEDURE
  1. Start engine and run at normal operating temperature.
  2. Operate the A/C system at "MAX" with blower speed on "HIGH".
  3. Allow the A/C compressor to cycle at least three (3) times.
  4. Check the pressure switch area for noise.
    If the noise is coming from the pressure switch area, proceed to step #5.
    If the noise is not coming from the pressure switch, refer to the workshop manual or NVH manual for troubleshooting and repair procedures.
  5. Replace the expansion valve according to the instructions in section G of the BETM.
    WARNING:
    Always follow general shop safety practices and all safety and refrigerant recovery practices.
    CAUTION:
    Component failure may result if the system is not evacuated. Evacuate and hold vacuum at 29.9 inches (760 mm-hg) for at least 15 minutes to ensure through evacuation.
  6. Charge A/C system (to 750 grams +/- 50) and verify repair.

PARTS INFORMATION
Expansion valve - BC1M-61-J14 Qt. 1 Interchangeability: A
See the bulletin for warranty information.


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Last modified: October 25 2007

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