2012-2019 Lincoln MKT Wiper Motor: Failure Symptoms & Replacement Guide

Common Symptoms of a Failing MKT Wiper Motor

When a wiper motor begins to fail, it rarely does so without warning. Understanding these signs can help you diagnose the problem before you're caught in a storm with no visibility. The most common cause of wiper issues is a faulty motor. Here are the key symptoms:

• Wipers Won't Move: The most obvious sign is a complete lack of movement when you activate the wiper switch. 🎬 See how to fix a windshield wiper that won't move This can be intermittent at first, working one day and not the next, before failing completely.
• Slow or Erratic Operation: The wipers may move much slower than usual, even on the highest speed setting. They might also seem to stutter, pause mid-swipe, or move at inconsistent speeds.
• Wipers Won't Park Correctly: When you turn the wipers off, they should return to their resting position at the base of the windshield. A classic sign of a failing motor is when the wipers stop in the middle of the glass or wherever they happen to be when the switch is turned off. This points to a failure of the internal park switch.
🎬 Watch this guide on diagnosing wipers that stop mid-swipe
• Only One Speed Works: Often, the motor will lose its low-speed function and only operate on the highest speed setting. This typically indicates a problem with the motor's internal resistor or control module.
• Humming or Grinding Noises: You may hear a distinct electrical humming or mechanical grinding sound coming from the base of the windshield when the wipers are supposed to be running. A humming sound with no movement suggests the motor is receiving power but is seized internally, while grinding can indicate stripped gears.

Known Issues, Recalls, and Service Bulletins

As of this writing, there are no specific recalls or Technical Service Bulletins (TSBs) from Lincoln or the National Highway Traffic Safety Administration (NHTSA) for widespread failure of the windshield wiper motor on the 2012-2019 Lincoln MKT. Problems with this part are generally considered the result of normal wear and tear over the vehicle's life. A recall for the 2012 MKT (NHTSA Recall No. 15V340000) pertains to the electric power steering motor, not the windshield wiper motor.

Buying a Used 2012-2019 MKT Wiper Motor: What to Check

A used OEM wiper motor can be a smart, cost-effective purchase, often providing better longevity than a cheap aftermarket alternative. However, careful verification is essential to avoid buying an incompatible part.

1. Critical Compatibility Checks

• 2012 Model Year Split: For 2012 Lincoln MKTs, this wiper motor is only compatible with vehicles built on or after February 2nd, 2012. You must verify your vehicle's production date (found on the driver's door jamb sticker) before ordering.
• Rain-Sensing Wipers: The Lincoln MKT was available with an automatic rain-sensing wiper system. Motors for vehicles with and without this feature may have different internal electronics and wiring connectors. Always confirm if the donor vehicle had the same option as yours. The safest bet is to match the part number exactly.
• Part Number Verification: The most reliable method is to match the part number from your original motor. The primary Ford part number is DE9Z-17508-A (also seen as DE9Z17508A). The corresponding Motorcraft service part number is WM818.

2. Physical Inspection

When inspecting a used motor, look for these red flags:

• Corrosion: Check the electrical connector pins for any green or white corrosion. This indicates water intrusion, which is a primary cause of failure.
• Output Shaft: Inspect the splines on the metal output shaft where the wiper linkage attaches. They should be clean and well-defined, not stripped or rusted.
• Housing Condition: Avoid motors with cracked plastic housings or excessive rust on the metal casing.

Replacement Overview & Difficulty

Replacing the wiper motor on a Lincoln MKT is a manageable DIY project for someone with basic tools and mechanical aptitude. The process does not typically require special programming or calibration.

• Difficulty: 2.5 out of 5
• Estimated Time: 1-1.5 hours
• Tools Needed: Socket set, trim removal tools, flathead screwdriver, Torx bits (potentially).

The basic steps involve:

1. Marking the wiper blade positions on the windshield with tape.
2. Removing the plastic caps at the base of the wiper arms and undoing the nuts.
3. Gently prying the wiper arms off their splined posts.
4. Removing the plastic clips and screws holding the windshield cowl (the large plastic panel between the hood and windshield) and carefully removing it.
5. The wiper motor and linkage assembly will now be visible. Disconnect the electrical connector from the motor.
6. Unbolt the motor from the firewall or linkage assembly. You will need to detach the linkage arm from the motor's output shaft.
7. Before installing the new motor, plug it in and run it for one cycle, then turn it off. This ensures it stops in the correct 'park' position.
🎬 Watch: How to reset windshield wipers to the correct position
8. Installation is the reverse of removal. Be sure to lubricate the linkage pivot points during reassembly.

Cost Comparison: New vs. Used MKT Wiper Motor

Prices can vary based on supplier and location. The following is an estimated breakdown:

Note: Labor costs are estimates and can vary by region. Total replacement cost at a repair shop can range from $412 to $463.

Frequently Asked Questions (FAQ)