Chevrolet K10 Windshield Washer Pump Replacement Guide (1979-1986)
Everything you need to know to replace the windshield washer pump on your 1979-1986 Chevy K10.
- First, confirm which of the two pump styles your K10 has: mounted on the wiper motor or in the fluid reservoir.
- Symptoms include no spray, no pump sound, or a very weak spray.
- Replacing the pump is a simple, low-cost DIY job that can be done in under an hour.
- Quality aftermarket brands like Trico are a reliable and cost-effective choice for this repair.
Is Your Windshield Washer Pump Failing?
A non-working washer system on your K10 is more than an annoyance; it can be a real safety issue when your windshield gets dirty. Diagnosing a bad pump is usually straightforward. The first step is to make sure your washer fluid reservoir isn't empty. If it's full, try to activate the washers and listen for a humming sound from the pump.
- You hear a hum, but no fluid sprays: This means the pump motor is getting power, but it's likely failed internally, or you have clogged or disconnected washer hoses.
- You hear nothing at all: If there's no sound when you hit the switch, the pump motor is likely dead or isn't receiving power. Before replacing the pump, it's wise to check the fuse for the wiper/washer system.
- The spray is weak or uneven: This can be a sign of a dying pump that can no longer create enough pressure, or it could simply be clogged nozzles. You can try cleaning the nozzle openings with a small pin to see if that restores a healthy spray pattern.
Choosing the Right Aftermarket Pump for Your K10
For a truck from this era, you don't need to hunt down an expensive New Old Stock (NOS) GM part. Modern aftermarket pumps are reliable, affordable, and sometimes even an upgrade over the original design. The most important factor is identifying which style of pump your truck has.
Two Types of Washer Pumps on 1979-1986 K10s
| Pump Type | Location | How to Identify |
|---|---|---|
| Wiper Motor-Mounted Pump | Bolted directly to the windshield wiper motor on the firewall. | Look for the wiper motor on the driver's side firewall. The washer pump will be a small assembly attached to it with hoses coming out. This original style often produces a pulsing spray. |
| Reservoir-Mounted Pump | Pushes into a rubber grommet at the bottom of the washer fluid reservoir. | Look at your plastic washer fluid bottle. You will see the bottom of the pump and an electrical connector plugged into it. This style provides a continuous spray. |
Aftermarket brands like Trico offer quality replacements that are designed for easy installation. They are engineered to provide performance similar to the original equipment and are a dependable choice for this repair. You will also find reliable options from brands like ACI and AC Delco (GM's official parts brand). For this part, the quality difference between a reputable aftermarket brand and an OE-style part is minimal, making the aftermarket a smart, cost-effective choice.
Windshield Washer Pump Replacement Cost
Replacing the washer pump on a 1979-1986 K10 is an inexpensive repair, especially if you do it yourself. The job is simple and requires basic hand tools.
| Part/Service | Estimated Cost |
|---|---|
| Shop Labor | $50 - $150 |
| New Aftermarket Pump | $24.64 - $31.96 |
| New OEM/AC Delco Pump | $20 - $30 |
| Used OEM (Wiper Motor Assembly) | $75+ |
Pro Tip: When replacing a reservoir-mounted pump, it's a good idea to also replace the small rubber grommet it seals against. These can get hard and brittle over time, causing leaks.
Frequently Asked Questions
Is replacing the washer pump a DIY job?
Yes, absolutely. For a reservoir-mounted pump, you simply unplug the wire, pull the old pump out, push the new one in, and reconnect the hose and wire. For a motor-mounted pump, you'll need to remove a few screws to detach it from the wiper motor. Either way, it's a job most owners can do in under an hour with basic tools.
My original pump pulses. Will a new one do that?
Original pumps that were integrated with the wiper motor were often mechanical and created a pulsing spray. Many modern aftermarket replacements, even for that style, are electro-mechanical and will produce a stronger, continuous spray, which most users find to be an improvement.
Are there any recalls on the K10 washer pump?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no recalls or widespread issues for the windshield washer system on the 1979-1986 Chevrolet K10. Recalls for washer systems on other GM vehicles do not apply to this generation of trucks.
Can I upgrade to the in-reservoir pump style?
Yes. Some owners choose to upgrade from the wiper-motor-mounted pump to a newer-style in-reservoir pump for its reliability and steady spray. This involves getting a reservoir that accepts a pump, the pump itself, and extending the two power wires from the wiper motor harness down to the new pump location.
Technical Specifications
OEM Part Numbers: 8-6700
The primary specification is the mounting type. The pump is either a direct-fit replacement for the unit mounted on the wiper motor or a press-in fit for the washer fluid reservoir. Most are 12-volt, two-wire electrical connections.
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.