Chrysler Imperial Windshield Washer Pump Guide (1985-1993)
A clear windshield is a must for your classic Imperial; here’s what to know when your washer pump fails.
- The most common sign of failure is a silent pump; always listen for the motor's hum when you activate the switch.
- Failures are almost always due to age; there are no specific recalls or TSBs for this part on your Imperial.
- A new aftermarket pump from a brand like Trico is the most practical and reliable replacement option, as new OEM parts are unavailable.
- Replacement is a simple DIY task that usually takes less than an hour and requires basic tools.
Is Your Imperial's Windshield Washer Pump Failing?
For the 1985-1993 Chrysler Imperial, a failing windshield washer pump is a common issue, primarily due to the age of the vehicle. The signs are usually straightforward, making it an easy part to diagnose. Before you assume the pump is bad, it's wise to check the simple things first.
Pro Tip: Always check your washer fluid level and the system's fuse before ordering a new pump. Sometimes the nozzles on the hood get clogged with wax or debris; a small pin can be used to gently clean them out.
Top 3 Signs of a Bad Washer Pump
- Motor is Silent: When you activate the washer switch, you should hear a distinct humming sound from the pump. If there's no sound at all, the pump has likely failed or is not receiving power.
- No Fluid Spraying: You can hear the pump running, but no fluid comes out. This can happen if the pump's internal components are worn out and can no longer move the fluid, or if the lines are clogged or leaking.
- Weak or Uneven Spray: If the fluid just dribbles out or doesn't reach the entire windshield, the pump motor is likely getting weak and can't build enough pressure.
Choosing the Right Aftermarket Pump
Finding a new original equipment (OEM) washer pump from Mopar for a classic Imperial is nearly impossible. Fortunately, the aftermarket provides reliable and affordable solutions. For this specific vehicle, a direct-fit aftermarket pump is the most practical and common choice.
- Quality: Brands like Trico and others such as ACI and ACDelco offer replacement pumps designed to meet or exceed original specifications. They are made to be a direct replacement, often requiring no modifications to install.
- OEM vs. Aftermarket: Given the age of the Imperial, a new aftermarket pump is a significant upgrade over a used, salvaged OEM part, which would likely have similar age-related wear. Aftermarket parts are readily available, affordable, and come with a warranty, which a used part does not.
Part Cost Comparison
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Trico, etc.) | $15 - $30 |
| New OEM (Mopar) | Not Generally Available |
| Used OEM | Varies, not recommended |
Known Issues, Recalls, and Bulletins
There are no specific recalls or Technical Service Bulletins (TSBs) from the NHTSA for the windshield washer pump on the 1985-1993 Chrysler Imperial. Failures are almost always due to the natural aging of the part. While Chrysler has issued recalls for washer pumps on much newer vehicles, these do not apply to this generation of Imperial.
Frequently Asked Questions (FAQ)
Is it difficult to replace the washer pump on a 1985-1993 Imperial?
No, it is generally considered an easy DIY job. The pump is typically located at the bottom of the washer fluid reservoir. Access is usually gained by removing a portion of the passenger-side front wheel well liner. The pump pulls out of a rubber grommet, the electrical connector is unplugged, and the hose is removed. The entire process usually takes less than an hour.
What causes the washer pump to fail?
The most common cause is simply age. The electric motor's internal components wear out. Another frequent cause is running the pump while the reservoir is empty, which can cause the motor to overheat. In colder climates, fluid freezing in the lines can also strain and damage the pump.
I replaced the pump and it still doesn't work. What now?
If a new pump doesn't solve the problem, you have an electrical issue. Start by checking the fuse again. If the fuse is good, check for power at the pump's electrical connector with a test light or multimeter when an assistant activates the switch. If there's no power, the problem could be in the wiring or the multifunction switch in the steering column.
Can I use a universal washer pump?
While universal pumps exist, it is highly recommended to use a direct-fit replacement for your Imperial. A direct-fit model ensures the electrical connector and hose ports match perfectly, making installation quick and avoiding any need for custom wiring or modifications.
Technical Specifications
OEM Part Numbers: 4389015
The replacement pump is typically a 12V electric motor that press-fits into the washer fluid reservoir using a rubber grommet. It will have one fluid outlet port and a specific electrical connector matching the vehicle's harness.
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.
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