Lincoln Mark III Windshield Washer Pump Replacement Guide (1970-1971)
Everything a Mark III owner needs to know about replacing a failed windshield washer pump.
- The most common failure symptom is hearing no sound from the pump when you press the button.
- A new aftermarket pump from a brand like Trico is the most practical and cost-effective solution.
- This is an easy DIY repair that most owners can complete in under an hour with basic tools.
- There are no recalls or TSBs from NHTSA for this part on your vehicle.
Is Your Windshield Washer Not Spraying?
If you push the washer button on your 1970-1971 Lincoln Mark III and nothing happens, the washer pump is a likely culprit. On these classic Lincolns, a common sign of failure is that you hear no sound at all from the pump when you try to use it. This usually means the small electric motor inside the pump has worn out after decades of service. Before replacing the pump, it's wise to check the fuse and ensure the washer fluid reservoir is full.
Symptoms of a Bad Washer Pump
- No Fluid Sprays: The most obvious symptom. The nozzles don't spray any washer fluid on the glass.
- No Sound: You don't hear the familiar whirring or humming noise of the pump motor when the washer button is pressed.
- Low Spray Pressure: If fluid only dribbles out, the pump motor may be weak and failing, although this can also be caused by clogged lines or nozzles.
Check the Switch First
In some cases, the problem might not be the pump but the activation switch in the dashboard. A Lincoln Mark III owner in an online forum traced their issue to a gummed-up switch. An easy way to test this is to have a helper press the button while you listen for a click or hum from the pump itself under the hood.
Choosing a New Aftermarket Pump
Finding a brand-new original Motorcraft pump for a 1970-71 Mark III is nearly impossible and very expensive if you do find one. For this repair, a new aftermarket pump is the most practical and affordable choice. Aftermarket parts are new parts made by companies other than the original manufacturer.
Trico Windshield Washer Pumps:
Trico is a well-known brand that produces replacement washer pumps. They offer universal pumps designed to work on a wide variety of classic vehicles like the Mark III. These pumps are known for being easy to install and reliable. Since they are universal, they provide a modern, efficient motor that restores function effectively. For your Mark III, a Trico pump is a solid, budget-friendly choice that gets the job done.
Pro Tip: Installation
Replacing the washer pump is a straightforward job for a DIY mechanic. The pump is located on or near the washer fluid bottle in the engine bay. The process typically involves disconnecting the two wires and two hoses, unbolting the old pump, and installing the new one in its place. No special tools are required.
Cost of Replacing a Windshield Washer Pump (1970-1971 Lincoln Mark III)
| Part Type | Part Cost | Notes |
|---|---|---|
| New Aftermarket (Trico, ACI) | $23.94 - $24.64 | The most common and recommended option. Readily available and affordable. |
| New OEM (Motorcraft) | $180+ | Extremely rare New Old Stock (NOS). Not a practical choice for most owners. |
| Used OEM | $15 - $40 | Available from salvage yards, but its age and condition are unknown. |
| Shop Labor | $50 - $100 | A repair shop will likely charge for 0.5 to 1.0 hour of labor for this simple task. |
Frequently Asked Questions
Do I need a special pump for my Mark III?
No, you do not need a highly specialized pump. The original was a simple 12V electric pump. A universal aftermarket pump from a brand like Trico is designed to work well as a replacement for many classic cars, including the 1970-1971 Mark III.
Where is the washer pump located?
The windshield washer pump is typically mounted directly onto the washer fluid reservoir bottle or very close to it in the engine compartment. Follow the fluid hose from the spray nozzles back to the reservoir to find it.
Are there any recalls for the washer pump on a 1970-71 Mark III?
No. A search of the National Highway Traffic Safety Administration (NHTSA) database shows no recalls, investigations, or technical service bulletins for the windshield washer system on the 1970-1971 Lincoln Mark III.
Can I replace the washer pump myself?
Yes, this is a great DIY project for beginners. The job requires only basic hand tools and can usually be completed in under an hour. The pump is easy to access in the engine bay.
Technical Specifications
OEM Part Numbers: EOPF-17D443-AA
Voltage: 12V, Terminal Type: Lead Wire, Hose Ports: 1
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.