Technical Service Bulletins
|Publication Date: March 21, 2003|
Article 02-21-5 is being republished in its entirety to provide an inspection procedure.
Some 2001-2002 Bi-Fuel F-150 vehicles may exhibit heavy static and possible loss of signal on customer installed two-way radios operating in the range of 47 MHz. Operation of HVAC blower motor and windshield wipers may increase severity of symptoms. This may be caused by the Compuvalve and Blower Motor Harness.
Inspect if latest level components have been installed. If latest level components have not been installed, install a replacement Compuvalve and a replacement HVAC blower motor harness. Refer to the following Service Procedure for details.
Inspect HVAC blower motor harness to determine if vehicle was built with latest level harness or was already replaced during previous service. The latest level harness will have a coil assembly built into it. This coil will be about 3 inches in diameter, wrapped in foam tape, and located at the blower motor connector end of the harness (Figure 1).
Inspect Compuvalve to determine if vehicle is already equipped the latest level Compuvalve. The latest level Compuvalve will have a serial number prefix of “LS”. Any Compuvalve with a serial number of “LS” or sequentially higher, this TSB does not apply.
If the blower harness has been replaced, the TSB does not apply. If the vehicle does not have the modified blower harness, proceed with the TSB.
Disconnect J26 and check radio operation. If the electrical noise persists with J26 disconnected, this is not a compuvalve problem, do not replace the compuvalve. If the electrical noise disappears when J26 is disconnected, replace the compuvalve. If latest level components have been installed, refer to the appropriate Workshop Manual for audio and/or electrical noise diagnosis.
- Replace the Compuvalve 2L3Z-9F954-AE. Refer to Section 303-04D in Workshop Manual.
- Replace HVAC blower harness 3L3Z-18B574-AA (Figure 1).
- Remove connector from blower motor behind dash, right hand side of vehicle.
- Unplug the two connectors and remove short (8 inch) harness containing the blower connector.
- Install blower connector to blower motor.
- Reconnect remaining two connectors.
|PART NUMBER||PART NAME|
|3L3Z-18B574-AA||HVAC Blower Harness|
OTHER APPLICABLE ARTICLES:
203000, 203200, 207000
Figure 1 – Article 03-6-11
NOTE: The information in Technical Service Bulletins is intended for use by trained, professional technicians with the knowledge, tools, and equipment to do the job properly and safely. It informs these technicians of conditions that may occur on some vehicles, or provides information that could assist in proper vehicle service. The procedures should not be performed by “do-it-yourselfers”. Do not assume that a condition described affects your car or truck. Contact a Ford, Lincoln, or Mercury dealership to determine whether the Bulletin applies to your vehicle.
Copyright © 2003 Ford Motor Company