GMC S15 Jimmy Windshield Washer Pump Guide (1983-1991)
Everything you need to know to get your windshield washers spraying like new again on your 1983-1991 S15 Jimmy.
- The most common failure is the pump motor burning out, resulting in no sound or spray when activated.
- Replacement is a very simple DIY job that takes less than 30 minutes and requires minimal tools.
- Quality aftermarket brands like Trico are the best option, as new OEM parts are no longer available.
- Before replacing the pump, confirm it's getting power and that your washer fluid nozzles aren't simply clogged.
Is Your Washer Pump Failing?
A broken windshield washer pump on your GMC S15 Jimmy is more than a small problem—it's a safety issue. When your windshield gets dirty, you need to be able to clean it instantly. Here are the most common signs that your pump is worn out or has failed.
Common Failure Symptoms
- You hear nothing: You press the wash button, the wipers move, but you don't hear the familiar, quiet hum of the pump motor. This usually means the pump's electric motor has failed or isn't getting power.
- Motor hums, but no fluid sprays: If you can hear the pump working but nothing comes out, the problem could be a clogged filter at the pump's intake, blocked hoses, or an internal failure in the pump itself.
- Weak or uneven spray: If the fluid just dribbles out or doesn't reach the whole windshield, the pump may be getting weak and unable to create enough pressure. This can also be caused by clogged nozzles, which you can clean with a small pin.
- Puddles under the reservoir: If you notice washer fluid on the ground under the reservoir, the pump's seal or the grommet holding it to the tank has likely dried out and cracked.
Check This First!
Before you buy a new pump, make sure the washer fluid reservoir is full. Also, check the fuse for the wiper system. On these S15 Jimmys, the washer function is often tied to the wiper motor. If you're having other wiper issues, the problem might be with the wiper motor's circuit board, not the pump itself. A simple way to be sure is to use a multimeter to check for 12-volt power at the pump's electrical connector when a helper presses the wash button.
Choosing a New Aftermarket Pump
For a vehicle like the 1983-1991 S15 Jimmy, finding a brand new Original Equipment (OE) pump from a GM dealer is nearly impossible. The original parts have been discontinued for years. This makes high-quality aftermarket parts the best and most practical choice.
Aftermarket (Trico): Brands like Trico specialize in wiper and washer systems and have been around for a long time. Their pumps are designed to be direct-fit replacements that are easy to install. Reviews show that owners find them to be a reliable and cost-effective solution that fits and works correctly. Given the low cost and simple design, a new aftermarket pump is a better choice than a used part from a junkyard, which could fail at any time.
Estimated Costs for Windshield Washer Pump Replacement
| Part Type | Part Cost | Notes |
|---|---|---|
| New Aftermarket (Trico) | $20 - $30 | The most common and recommended option. Includes a new pump and grommet. |
| New OEM | N/A | Generally not available for a vehicle of this age. |
| Used OEM | $5 - $15 | Pulled from a junkyard. Low cost, but no guarantee on how long it will last. |
| Shop Labor | $50 - $100 | This is a very quick job, so expect to pay the shop's minimum labor charge (0.5-1.0 hours). |
DIY Installation is Easy
Replacing the washer pump on an S15 Jimmy is one of the easiest repairs you can do. It requires few or no tools and usually takes less than 30 minutes. The pump simply pulls out of a rubber grommet on the reservoir. This is a great project for a first-time DIYer.
Frequently Asked Questions
Is it difficult to replace the washer pump myself?
No, this is a very easy job. You will need to drain the washer fluid, unplug the electrical connector, disconnect the hose, and pull the old pump out. The new one pushes right back in. Many owners can do it in under 30 minutes with basic tools.
Do I need to replace the whole reservoir?
No, not unless the reservoir itself is cracked and leaking. The pump is sold as a separate component that plugs into the bottom of the existing reservoir. New aftermarket pumps come with the required rubber grommet to ensure a tight seal.
My new pump is working, but the spray is still weak. What's wrong?
If the pump is running, the problem is likely a blockage after the pump. Check for kinked or cracked hoses. Most often, the spray nozzles on the hood are clogged with old wax or debris. Use a small pin or needle to clear the holes in the nozzles.
Were there any recalls for the S15 Jimmy washer pump?
Searches of the NHTSA database did not show any specific recalls for the windshield washer pump on the 1983-1991 GMC S15 Jimmy. Recalls for other GM vehicles related to heated washer systems or wiper motors do not apply to this model.
Technical Specifications
The windshield washer pump for this vehicle is a small, 12-volt electric pump that press-fits into a rubber grommet at the bottom of the washer fluid reservoir. It typically has one electrical connector and one outlet port for the washer hose.
We Have This Part in Stock
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.
- GMC S15 Jimmy: