1987-1989 GMC R2500 Windshield Washer Pump Guide
Get your windshield washers working again on your classic R2500—it's often a simple and inexpensive fix.
- A failing washer pump is a safety issue; replacement is simple and inexpensive.
- Before replacing the pump, check for clogged nozzles, low fluid, and blown fuses.
- Aftermarket pumps from brands like Trico are a reliable and cost-effective choice for this truck.
- Replacement is a great DIY task, typically taking less than 30 minutes with basic tools.
Is Your Windshield Washer Pump Failing?
A faulty windshield washer pump is more than an inconvenience; it's a safety issue, especially in bad weather. On the 1987-1989 GMC R2500, the washer system is simple, and troubleshooting is straightforward. Before you replace the pump, check the easy things first: make sure your washer fluid reservoir isn't empty and check the fuse panel for a blown fuse. Also, use a small pin to ensure the nozzles on the hood aren't clogged with wax or debris.
Common Symptoms of a Bad Washer Pump
If the simple checks don't solve the problem, look for these signs of a failing pump:
- No Sound: You press the washer button and hear nothing. This usually means the pump's electric motor has failed or isn't getting power.
- Motor Hums, No Fluid: You can hear the pump motor running, but no fluid sprays out. This could mean the pump's internal impeller is broken or the system has a major clog.
- Weak Spray: The fluid barely reaches the windshield. This indicates the pump is losing its ability to create enough pressure.
- Leaks: You notice blue or purple fluid puddling under the washer fluid reservoir. The pump housing itself can crack with age, causing leaks.
Vehicle-Specific Issue: Fluid Dribble
A General Motors Technical Service Bulletin (TSB #87-T-63) was issued for 1987 R/V models (like your R2500) regarding washer fluid dribbling from the nozzles during turns. This was caused by an inline check valve designed to keep the lines primed. The official fix was to remove this check valve, which stops the dribble but may cause a slight delay before the fluid sprays on the first wipe. This is normal for trucks where the valve has been removed.
Choosing a New Aftermarket Pump
For a straightforward part like a washer pump on a classic truck, an aftermarket replacement offers excellent value. The original ACDelco pumps are reliable, but a quality aftermarket brand like Trico provides similar performance for less money. Trico is a well-established brand known for wiper and washer system components, and their pumps are designed for easy installation and reliability.
Pro Tip: Get the Grommet
The pump seals to the reservoir with a rubber grommet. Over time, this grommet becomes hard and brittle. Always replace it when you replace the pump to prevent leaks. Most new aftermarket pumps include a new grommet in the box.
Replacement Cost
Replacing the windshield washer pump on your R2500 is an inexpensive repair, whether you do it yourself or take it to a shop.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Pump (Trico) | $29 - $32 |
| New OEM Pump (ACDelco) | $45 - $75 |
| Shop Labor | $50 - $100 |
Frequently Asked Questions
Is this a difficult part to replace myself?
No, this is one of the easiest repairs you can do on your truck. The washer reservoir is held to the fender or firewall with just two bolts. The pump itself just pulls out of the reservoir and the new one presses in. It requires basic hand tools and usually takes less than 30 minutes.
Do I need to drain the washer fluid first?
Yes, you should drain the fluid or be prepared for it to spill out when you remove the old pump. You can either siphon it out from the top or place a bucket underneath as you pull the pump, which is located at the bottom of the reservoir.
The new pump is installed, but it still doesn't work. What now?
If a new pump doesn't solve the issue, the problem is likely electrical. Check the wiring connector for power with a test light when the switch is activated. On these trucks, a bad ground or a faulty wiper/washer switch on the steering column can also prevent the pump from working.
Are there any recalls for the washer pump on my truck?
No, searches of the NHTSA database show no safety recalls specifically for the windshield washer pump on the 1987-1989 GMC R2500.
Technical Specifications
OEM Part Numbers: 89001120
12V Electric Pump, Press-Fit into Reservoir, Single Outlet Port
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 R2500: