Cooling Fan - Noise/Poor Idle Quality
NO: 18-20-96GROUP: Vehicle Performance
DATE: Aug. 2, 1996
SUBJECT:
Cooling Fan Noise/Idle Quality
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 07-06-94 DATED SEPT. 2, 1994 WHICH SHOULD BE REMOVED FROM YOUR FILES AND NOTED IN THE 1994 TECHNICAL SERVICE BULLETIN MANUAL (PUBLICATION NO.81-699-95054). ADDITIONAL MODELS, REVISED PARTS AND PROCEDURES HAVE BEEN ADDED. ALL CHANGES ARE MARKED WITH **ASTERISKS**.
MODELS:
**1993 - 1996** (LH) Concorde/Intrepid/Vision/LHS/New Yorker
**NOTE:
THIS BULLETIN APPLIES TO VEHICLES BUILT BEFORE DEC. 31, 1995 (MDH-12-31-XX) EQUIPPED WITH A 3.5L ENGINE**.
SYMPTOM/CONDITION:
An audible "beat/boom" sound inside the passenger compartment when the vehicle is idling in drive, A/C on and the fan module is operating on high speed. This may also be described as poor idle quality.
DIAGNOSIS:
Many factors can contribute to this noise and vibration conditions. Use the following procedure to identify a noisy fan module.
1. Run vehicle with A/C off and cardboard between the radiator and condenser.
2. Using the DRB III, monitor coolant temperature and coolant fan mode.
3. Allow coolant temperature to rise to approximately 230 degrees F wherein the high speed fan will come on (to accelerate coolant temperature rise, run the engine at 2000 - 2500 RPM).
4. Remove cardboard.
5. Compare noise/vibration inside the closed vehicle, while idling in drive, under the following conditions:
^ High speed fan on.
^ High and low speed fans off (engine only), which occurs when coolant temperature drops below 200 degrees F.
6. If noise/vibration occurs only when the fans are on low or off, the problem may be caused by the engine. Perform the appropriate engine diagnostics. If the noise increases when the fans are on high speed, perform the Repair Procedure.
**NOTE:
TO ADDRESS IDLE QUALITY CONDITIONS, REFER TO THE TSB'S LISTED BELOW AND PERFORM THE REPAIRS AS NECESSARY.
1993-1994 M.Y., TECHNICAL SERVICE BULLETIN 18-29-94 DATED JAN. 13, 1995
INSTALL REVISED SPARK PLUGS AND UPDATE PCM
1995 M.Y., TECHNICAL SERVICE BULLETIN 18-15-95 DATED MAY 5, 1995
INSTALL REVISED SPARK PLUGS AND REPROGRAM THE PCM
1996 M.Y., NOT INVOLVED**
PARTS REQUIRED:
1 **4596212** Fan Module
REPAIR PROCEDURE:
**This bulletin involves replacing the cooling fan module with a revised part and verifying and updating the spark plugs and PCM if necessary**.
1. Disconnect the fan wiring connector from the RFI module.
2. Remove fan module to radiator fasteners and retaining clips.
3. Remove fan module assembly from radiator.
4. Install new assembly to radiator. Attach retaining clips and torque shroud fasteners to 5 Nm (45 in.lbs.).
5. Connect RFI module lead.
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 07-20-01-92 0.8 Hrs.
Fan Module
1993-1996 Concorde, Intrepid, Vision
Fan Module
1994-1996 LHS, New Yorker 0.9 Hrs.
FAILURE CODE: 2X - Vibration or Chatter