A/C - Grinding Noise When Changing Modes
TSB 08-8-904/28/08
GRINDING NOISE FROM CLIMATE CONTROL -
CHANGING AIR DISTRIBUTION MODES - BUILT
AFTER 11/29/2005
FORD:
2005-2008 F-150
LINCOLN:
2006-2008 Mark LT
ISSUE
Some 2005-2008 F-150 (excludes Heritage) and 2006-2008 Lincoln Mark LT vehicles built after 11/29/2005 may exhibit a grinding noise from the climate control system while changing air distribution modes.
ACTION
Perform the following Service Procedure to correct the condition.
SERVICE PROCEDURE
1. Set control head to panel mode.
NOTE
DO NOT ENERGIZE THE MODE DOOR MOTOR WITHOUT IT BEING CONNECTED TO THE UPPER PLENUM.
2. Leaving the motor plugged in and installed to the cam plate, remove the four bolts that attach the cam plate to the upper plenum. (Figure 1)
3. Remove cam plate.
4. Remove cam.
5. Clean all existing lube from cam.
6. Liberally apply Motorcraft(R) PTFE Lubricant to the cam tracks. (Figure 2)
7. Reassemble components in reverse order of removal.
8. Cycle the control head from panel to defrost mode a few times until the noise is eliminated.
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
080809A 2005-2008 F-150, 0.4 Hr.
2006-2008 Mark LT:
Remove Distribution Mode
Door Cam and Replace
Cam Lubricant.
DEALER CODING
CONDITION
BASIC PART NO. CODE
18471 41
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