2007-2009 Mercedes-Benz GL320 Windshield Washer Pump Replacement Guide
Everything you need to know before replacing the windshield washer pump on your GL320.
- A silent pump is the key symptom of failure; first check the fuse, then plan to replace the pump.
- Replacement is a simple DIY job, accessible by removing the front passenger wheel and fender liner.
- Aftermarket brands like Trico and Vemo are cost-effective and suitable for this non-critical part.
- Ensure the replacement pump has two outlets, as required for the GL320.
Is Your GL320 Windshield Washer Pump Failing?
A non-working windshield washer is more than an annoyance; it's a safety issue. If your 2007-2009 GL320 isn't spraying fluid, the washer pump is a common culprit. Before you buy a new part, it's important to confirm the pump is the problem.
Diagnosing the Failure
There are two main scenarios when a washer pump fails:
- You hear nothing: Turn the ignition on (without starting the engine) and activate the washer switch. If you hear no humming or whirring sound from the front passenger-side wheel area, the pump is likely not receiving power or has failed completely. The first step is to check the fuse for the washer system. If the fuse is good, the pump motor has likely burned out.
- You hear the pump, but no fluid sprays: If you can hear the pump motor running, the problem lies elsewhere in the system. Common causes include an empty reservoir, clogged spray nozzles, or a blocked pump filter. The small rubber grommet where the pump pushes into the reservoir also acts as a filter and can get clogged with slime or debris from old washer fluid.
Pro Tip: Before assuming the pump is bad, use a safety pin to gently clean the spray nozzles on the hood. Also, check for fluid leaks under the front passenger side of the vehicle, which could indicate a cracked reservoir or a bad seal at the pump.
Choosing a New Aftermarket Washer Pump
For the GL320, you don't need to pay high dealership prices for a reliable replacement. Aftermarket pumps offer a significant cost saving and are a practical choice for this component.
Brand Quality: Trico vs. Vemo
When shopping for an aftermarket pump, you will likely encounter brands like Trico and Vemo.
- Trico: Trico is a well-established brand, primarily known for its windshield wipers since 1917. They offer direct-fit replacement washer pumps designed to match original factory performance. They are generally considered a reliable, standard-quality aftermarket option.
- Vemo: Vemo is another popular aftermarket brand. While some user experiences are positive, with pumps lasting for years, they are generally seen as a mid-tier brand. For a simple part like a washer pump that is not critical to the vehicle's operation, many owners find Vemo to be a good balance between cost and quality.
Ultimately, both brands are a cost-effective alternative to the much more expensive OEM part. Given the simple function of the pump, either brand should provide reliable service.
Important: The GL320 (X164 chassis) uses a pump with two outlets. Some models are also equipped with headlight washers, which use a separate pump. Ensure you are purchasing the correct pump for the windshield washer system.
Cost of Replacing a GL320 Windshield Washer Pump
Replacing the washer pump is an affordable repair, especially if you do it yourself. Below are the typical costs you can expect.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Trico, Vemo) | $34 - $36 |
| New OEM (Genuine Mercedes-Benz) | $140 - $150 |
| Shop Labor | $95 - $160 |
Frequently Asked Questions (FAQ)
Is replacing the washer pump a DIY job?
Yes, this is a very DIY-friendly job for someone with basic tools. It involves safely jacking up the vehicle, removing the front passenger wheel, and pulling back the plastic fender liner to access the pump at the bottom of the reservoir. The pump pulls straight out. The entire process typically takes about an hour.
Where is the windshield washer pump located on the GL320?
The pump is located at the bottom of the windshield washer fluid reservoir. The reservoir itself is situated in the front of the vehicle, behind the passenger-side front wheel well.
Are there any recalls for the washer pump on this vehicle?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database show no open recalls or specific technical service bulletins (TSBs) for the windshield washer pump on the 2007-2009 Mercedes-Benz GL320.
My pump runs, but the spray is weak. What's the problem?
A weak spray is usually caused by a blockage, not a failing pump. The most common culprit is the small filter grommet that the pump sits in, which can get clogged with gel-like residue. You can try cleaning this grommet before replacing the entire pump. Clogged nozzles are another possibility.
Technical Specifications
OEM Part Numbers: 1648690421
Dual Outlet Pump
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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.
- Mercedes-Benz GL320: