ISSUE Some 2009-2010-2020 Explorer, Mountaineer and Explorer Sport Trac vehicles equipped with a 5R55S transmission may exhibit a high frequency whistle noise at idle in any gear position with the transmission fluid temperature at or above 170 degrees Fahrenheit (76 degrees Celsius). ACTION Follow the Service Procedure steps to correct the condition.

ISSUE Some 2009-2010-2020 Explorer, Mountaineer and Explorer Sport Trac vehicles equipped with a 5R55S transmission may exhibit a high frequency whistle noise at idle in any gear position with the transmission fluid temperature at or above 170 degrees Fahrenheit (76 degrees Celsius).

ACTION Follow the Service Procedure steps to correct the condition.

DisclaimerTechnical Service Bulletin # 09-21-4 Date: 091102

A/T - Whistling Noise When Hot TSB 09-21-4

11/02/09

5R555 TRANSMISSION - WHISTLE NOISE WHEN HOT

FORD: 2009-2010-2020 Explorer Sport Trac, Explorer

MERCURY: 2009-2010-2020 Mountaineer

This article supersedes TSB 09-12-5 to update the Service Procedure and Part List.

ISSUE Some 2009-2010-2020 Explorer, Mountaineer and Explorer Sport Trac vehicles equipped with a 5R55S transmission may exhibit a high frequency whistle noise at idle in any gear position with the transmission fluid temperature at or above 170 degrees Fahrenheit (76 degrees Celsius).

ACTION Follow the Service Procedure steps to correct the condition.

SERVICE PROCEDURE

1. Install IDS/PDS or equivalent.

2. Verify that the transmission fluid temperature (TFT) PID is above 170 °F (76 °C).

a. If it is not at 170 °F (76 °C), drive unit approximately 3 miles (5 Km) to reach temperature.

2010-2020 Ford Truck Explorer AWD V8-4.6L               Page 21

b. If it is at 170 °F (76 °C), proceed to Step 3.

3. Return vehicle to idle and verify high frequency whistle noise is present in all gear selector positions (P-R-N-D-L). While Vehicle is at idle in park increase engine RPM by 150 to 200 RPM's the whistle noise will go away.

a. If the above whistle condition can be verified in all gears proceed Step 4.

b. If the whistle condition cannot be verified or is not present in all selector gear positions please follow the normal diagnostic routine procedures outlined in the Workshop Manual (WSM), Section 307-01.

4. Replace the main control separator plate following the WSM, Section 307-01A for Main Control Removal and Disassembly and Assembly of Subassemblies Main Control Valve Body.

NOTE VERIFY THE NEW REPLACEMENT SEPARATOR PLATE HAS TWO (2) ORIFICE LOCATIONS TO ASSURE YOU HAVE THE LATEST LEVEL. (FIGURES 1-2)

Parts Block

WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.

OPERATION DESCRIPTION TIME

092104A 2009-2010-2020 Explorer, 2.2 Hrs. Mountaineer, Explorer Sport Trac: Replace The Main Control Separator

2010-2020 Ford Truck Explorer AWD V8-4.6L               Page 22

Plate And Includes Time To Diagnose (Do Not Use With Any Other Labor Operations)

DEALER CODING

CONDITION BASIC PART NO. CODE 7Z490 42