Mitsubishi Endeavor Engine Water Pump: A Guide for 2004-2011 Models
Understanding the critical role of the water pump in your Endeavor's 3.8L V6 engine.
- The water pump is driven by the timing belt; a pump failure can cause catastrophic engine damage.
- Always replace the water pump, timing belt, tensioner, and idlers together as a complete kit to save on labor and ensure reliability.
- Choose a high-quality kit from a reputable brand like Gates, Dayco, or GMB; avoid budget parts for this critical job.
- Do not drive your vehicle if you suspect a water pump failure, as it can lead to rapid overheating and engine seizure.
Is Your Endeavor's Water Pump Failing?
A failing water pump is a serious issue that should not be ignored. Because it is driven by the timing belt, a complete failure can destroy your engine. Look for these common warning signs:
- Coolant Leaks: This is the most common symptom. You may find puddles of green or pink coolant under the front of your engine. The leak often comes from a small "weep hole" on the pump, designed to signal that the internal seals are wearing out.
- Engine Overheating: If the pump fails, it cannot circulate coolant, causing the engine temperature to rise quickly. You might see the temperature gauge spike into the red or steam coming from the engine bay.
- Grinding or Whining Noises: A high-pitched whining or a low-pitched grinding sound from the front of the engine can indicate a worn-out bearing inside the water pump. This is a sign of imminent failure. 🎬 Watch: A mechanic explains common symptoms of water pump failure.
- Heater Not Working: Your car's heater uses hot coolant to warm the cabin. If the water pump is failing, it may not circulate enough coolant to the heater core, resulting in cold air from the vents.
A Note on Weep Hole Leaks (TSB-19-14-001)
Mitsubishi has issued a Technical Service Bulletin (TSB) regarding water pump leaks. It states that a small amount of staining or residue near the weep hole can be normal as steam and mist pass through the seals. However, active dripping or a steady stream of coolant indicates a definite failure requiring replacement.
Choosing the Right Aftermarket Water Pump
Because replacing the water pump on an Endeavor is a labor-intensive job that requires removing the timing belt, the quality of the replacement part is extremely important. A cheap, low-quality pump that fails early will cost you far more in the long run. We recommend replacing the water pump, timing belt, tensioner, and idler pulleys as a complete kit.
Brand Quality Tiers
- Top Tier (Recommended): Gates, Dayco, GMB Kits. These brands are well-respected, and many are original equipment (OEM) suppliers to automakers. Buying a complete timing belt and water pump kit from one of these brands is the most reliable and cost-effective repair. These kits include all the necessary components that should be replaced at the same time.
- Mid Tier (Good Quality): Beck Arnley. Beck Arnley often sources parts from OEM manufacturers. While generally considered a quality brand, some user reviews are mixed, with reports of both long life and premature failure. If buying individually, ensure you also purchase a new timing belt and hardware.
- Economy Tier (Use with Caution): Airtex, US Motor Works. While these brands offer a lower price point, using a budget part for a component as critical as a timing-belt-driven water pump is a significant risk. Failure of the pump bearing could lead to a snapped timing belt and severe engine damage.
Pro Tip: The cost of this job is mostly labor. Always replace the timing belt, hydraulic tensioner, and idler pulleys when you replace the water pump. Failing to do so can lead to another expensive repair down the road when one of those other components wears out.
Estimated Replacement Costs
The total cost for a water pump replacement is high due to the labor involved with the timing belt service. Expect a professional shop to charge for several hours of work.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Water Pump (Part Only) | $64.77 - $85.82 |
| New OEM Water Pump (Part Only) | $150 - $250+ |
| Shop Labor | $375 - $550 |
| Total Professional Job (Aftermarket Kit + Labor) | $820 - $1,200+ |
Frequently Asked Questions (FAQ)
Do I absolutely have to replace the timing belt with the water pump?
Yes. The water pump is located behind the timing belt. About 90% of the labor cost is for accessing the belt and pump. Replacing only the pump and having the original belt or tensioner fail later would mean paying for the same expensive labor all over again. It is standard and essential practice to replace them all at once.
How long should a new water pump last?
A quality water pump, installed correctly as part of a timing belt service, should last for the next full service interval, which is typically 60,000 to 100,000 miles. 🎬 Watch: How to replace the water pump and timing belt. Using a quality kit from a brand like Gates or Dayco is the best way to ensure longevity.
What kind of coolant should I use in my Endeavor?
Always use a high-quality, phosphate-based Asian vehicle coolant, typically pink or green in color. Using the wrong type of coolant can cause corrosion and premature failure of cooling system components, including the new water pump.
Is this a DIY job?
This is an advanced DIY job. It requires specific tools, knowledge of how to properly set engine timing, and several hours of work. Mistakes during installation can lead to severe engine damage. If you are not an experienced mechanic, this job is best left to a professional.
🎬 See this step-by-step guide for the 3.8L timing belt service.Helpful Videos
Technical Specifications
OEM Part Numbers: 1300A063 MD979171
The water pump for the 2004-2011 Mitsubishi Endeavor is driven by the timing belt on the 3.8L 6G75 V6 engine. It typically features an aluminum housing and a steel impeller. The replacement job is considered an interference engine application, meaning incorrect timing can cause valves to hit pistons.
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.
- Mitsubishi Endeavor: