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2011 F-250 SD P/U - Multiplex Mode Actuator Assembly w Cable
Posted to HVAC Forum on 12/22/2012 22 Replies

2011 F-250 SD P/U - Multiplex Mode Actuator Assembly w Cable

Informational systems do not always supply us with a picture perfect course of action or a picture perfect ending. For instance: newer informational systems commonly lack real-life photos, pictures that depict the actual information, illustrations that do not mislead, and so-forth; which relates to an actual loss of a thousand words or more for each omission. Further, we pay for such lacking and substandard information.

To better understand the above statements, review the following provided herein regarding a 2011 Ford F-250 Super Duty Pickup. After you review the following, access your informational system and see how the following relates, or not, for the information you are paying for.

Complaint: lower than normal air flow (which by itself can be misunderstood by many technicians with newer vehicles concerning multiplex inclusions and technologies).

Verification: modes unable to complete, weaker than normal panel register air flow, weaker than normal floor duct outlet air flow, simultaneous panel register airflow and floor duct outlet airflow, and no defrost duct outlet air flow.

Diagnostics: no DTCs (in this case), able to send commands to MMAA, signals received at MMAA, limited movements of MMAA, and unable to achieve MMAA actuals (targets).

Plan of action: remove MMAA to verify all associated modes, and mode components, for proper function/movement.

Course of action: simple . . . right? Well, unless there is a way that doesn't require cutting or the hot-wrench, the next course of action is a bit entailed. To keep everyone awake, the basics were skipped . . . and, fast-forwarded to: disassembled and photos.

Presentation - Signature View: for authentication, tips to follow.

Access Hole for Bolt Removal: remove the left side body rubber plug within the door jam and remove the bolt. A 1/4-inch dive six-point socket, swivel, and extension taped together with electrical tape works well in removal efforts. A piece of electrical tape across the hex end of the socket helps lock the bolt in the hex for removal and installation. Caution: there is no reason to access behind the clear tape - do not puncture the clear transparent circular tape.

Light Shining Through Hole: visual aid, self-explanatory.

Interior Side: Through Bolt Goes Through Bracket to Secure Dash

Left Side Interior View

Left Interior: Two Bolts Removed: some informational systems have this information as ONE bolt only, which is incorrect.

Left Side Interior: Fastener Removal - Closer View: worth mentioning again - two bolts.

Multiplex Mode Actuator Assembly with Cable: the complexities involved for this particular part with today's systems offer one actuator motor using many combined movements through a series of cams, grooves, pins, levers, doors; and in this case, a cable as well.

Cable for Panel (Vent/Face) Mode: at first glance (in a first encounter, especially before dash disassembly), the cable function may be misinterpreted.

Multiplex Mode Actuator Assembly Top View: the mounting bolts for the actuator motor cannot be accessed while mounted to the HVAC housing/case without removing the Multiplex Mode Actuator Assembly. Even with the total Multiplex Mode Actuator Assembly removed, actuator motor removal requires further disassembly. A replacement Motorcraft Multiplex Mode Actuator Assembly comes complete, including the cable (snapped in place on the MMAA at both ends for protection) and the opposite end cable door lever.

Multiplex Mode Actuator Assembly Underneath View: if necessary to remove the individual actuator motor for whatever reason (once the Multiplex Mode Actuator Assembly is removed), remove the top black multiplex motion lever that controls the defrost slot and the white slotted lever for the floor, then remove the sandwiched white multiplex motion cam, then remove the underneath black multiplex motion lever that controls the white outer cased panel (vent/face) cable. Notice that the color coded black - controls white, and the color coded white - controls black. Note: a homemade two step dowel insert or equivalent aids in the collapsing of the retainer tab ends holding each of the black multiplex motion levers to prevent breaking the tabs off. The best course of action is to replace the entire Multiplex Mode Actuator Assembly. The Motorcraft part number for this particular vehicle - Motorcraft YH-1925.

Interior Left to Center View

Defrost Door Lever

Floor Door Lever

Interior Left to Right View

Interior Center to Right View

Interior Center View: Upper

Enhanced Interior Center View: Lower

Right Center Panel (Vent/Face) Mode Door with Reinforcement

Left and Right Panel (Vent and Face) Diffuser Routing Chambers

Interior Right to Left View

Interior Right to Center View

Temperature Blend Actuator

Right Interior: One Bolt Removed

Interior Right Side View

Outside-Fresh-Air/Recirculation-Air Actuator & ETS Connector

Interior Right to Left View From Door

The above is meant for informational purposes. If there are any discrepancies, please include the appropriate information and nature of the discrepancies for discussion and/or corrections to be made.

Glenn (H)

Glenn from Louisiana

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