A/C - Low Rpm Hooting Noise
TSB 04-18-309/20/04
A/C HOOT NOISE WHILE DRIVING
FORD:
2002-2005 Explorer
MERCURY:
2002-2005 Mountaineer
ISSUE
Some 2002-2005 Explorer 4dr/Mountaineer vehicles, without auxiliary rear air conditioning, may exhibit a brief hooting noise while the A/C is on. The noise may be described as a whistle coming from the vehicles front A/C vents. The condition occurs during light load acceleration at low speeds (1000-1300 RPM), with ambient temperatures of 85°F (29°C) or higher and high humidity.
THIS HOOT NOISE IS A SEPARATE ISSUE FROM BLEND DOOR SHAFT WHISTLE (TSB 03-07-04).
ACTION
Install a revised evaporator case. Refer to the following Service Procedure.
NOTE
THIS REPAIR SHOULD NOT BE PERFORMED ON VEHICLES EQUIPPED WITH AUXILIARY REAR AIR CONDITIONING.
SERVICE PROCEDURE
NOTE
ALL WORKSHOP MANUAL PROCEDURES MUST BE FOLLOWED IN THEIR ENTIRETY. FAILURE TO REMOVE AND REINSTALL COMPONENTS CORRECTLY MAY RESULT IN FUTURE A/C CONCERNS AND/OR INTERIOR RATTLE ISSUES.
1. Recover the refrigerant from the vehicle prior to removal of evaporator case assembly. Refer to Air Conditioning (A/C) System Recovery, Evacuation and Charging in Section (412-00) of the Workshop Manual.
2. Refer to Workshop Manual Section (412-00) for evaporator case removal instructions and remove the evaporator case from the vehicle.
NOTE
BE VERY CAREFUL REMOVING THE EVAPORATOR CASE FROM THE VEHICLE. VERIFY THAT ALL VACUUM LINES AND GROUND STRAPS ARE DISCONNECTED PRIOR TO REMOVAL.
3. Remove all components from the vehicle's existing evaporator case and reinstall them on the new case prior to case installation into the vehicle.
MANUAL SYSTEM COMPONENTS
^ Actuator
^ Vacuum Motor
^ Inlet Assembly
^ Inlet Bracket
^ Floor Ducts
^ Resistor
^ Blower Motor
^ Vacuum Harness
^ Wire Harness
^ Heater Core and Seal Assembly
^ Heater Core Cover
^ Heater Core Dash Seal
^ Heater Tube Cover
^ Drain Tube Dash Seal
ELECTRONIC SYSTEM COMPONENTS
^ Actuators
^ VBC
^ Blower Motor
^ Vacuum Harness
^ Wire Harness
^ Heater Core and Seal Assembly
^ Heater Core Cover
^ Heater Tube Cover
^ Inlet Assembly Inlet Bracket
^ Floor Ducts
^ Heater Core and Dash Seal
^ Drain Tube Dash Seal
^ Aspirator Tube
^ Solenoid
4. Install the revised evaporator case into the vehicle.
PARTS BLOCK
LABOR OPERATION CLAIMING CHART
WARRANTY STATUS:
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage
DEALER CODING
CONDITION
BASIC PART NO. CODE
19850 42
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