2023-2025 Honda Pilot Upper Coolant Hose (19501-6FB-A00): Leaks, Symptoms, and Replacement Guide

Part Name Confusion: Crossover Pipe vs. Upper Hose

While this component is sometimes referred to as a 'crossover pipe,' the official Honda parts catalog identifies part number 19501-6FB-A00 as the 'Upper Hose' or 'Hose, Water (Upper)'. It is the primary hose connecting the engine to the top of the radiator. A separate component, part number 19505-6FB-A00, is a metal 'Connector Pipe' located deeper in the engine assembly. This article focuses specifically on the upper hose assembly, 19501-6FB-A00.

Symptoms of a Failing Upper Coolant Hose

A failing upper coolant hose on your Honda Pilot will produce several distinct warning signs. Addressing them early is key to preventing severe engine damage.

• Visible Coolant Leaks: This is the most obvious symptom. You may find puddles of blue, green, or pink fluid under the front of your vehicle after it has been parked. The leak will typically originate from the top of the engine bay, near the radiator cap or where the hose connects to the engine.
• Sweet Smell: Engine coolant (antifreeze) has a distinct, sweet odor. If you smell this inside the cabin or around the front of the vehicle, it's a strong indicator that coolant is leaking and burning off on hot engine components.
• Engine Overheating: A significant leak will lower the coolant level, reducing the system's ability to cool the engine. This will cause the temperature gauge on your dashboard to climb into the red zone or trigger an overheating warning light.
• Visible Hose Damage: Inspect the hose itself. Look for signs of swelling, bulging, cracking, or becoming hard and brittle. Pay close attention to the plastic end connectors, as they can develop hairline cracks.
• Low Coolant Light: Your vehicle's information display may repeatedly warn you of a low coolant level, requiring you to top off the reservoir frequently.

Known Issues, TSBs, and Recalls

As of mid-2026, there are no specific recalls, Technical Service Bulletins (TSBs), or widespread documented issues from Honda or the NHTSA related to the upper coolant hose (19501-6FB-A00) for the 2023-2025 Honda Pilot. Coolant leaks on these newer models are more likely to be isolated part failures rather than a systemic design flaw.

Buying a Used 2023-2025 Pilot Upper Coolant Hose

For a newer vehicle like the 2023-2025 Pilot, a used OEM hose from a low-mileage donor vehicle can be an excellent value, offering the same quality as a new part for less money. Here’s what to check before buying:

1. Inspect the Entire Hose: Squeeze the rubber portion of the hose. It should feel firm but flexible, not rock-hard, brittle, or soft and spongy.
2. Check the Plastic Connectors: This is the most critical inspection point. Carefully examine the plastic ends for any hairline cracks, especially around the seams and hose clamp areas. A small crack can quickly fail under pressure.
3. Verify Sealing Surfaces: Look inside the connectors to ensure the O-rings or integrated seals are present and in good condition. They should be pliable and free of nicks or tears.
4. Confirm the Part Number: Ensure the part is stamped with 19501-6FB-A00 to guarantee a perfect fit for your Pilot.
5. Ask About Mileage: Choose a part from the lowest-mileage vehicle available. A hose from a 20,000-mile vehicle will have significantly more life left than one from a 100,000-mile vehicle.

Replacement Difficulty & Costs

Replacing the upper radiator hose is a straightforward task suitable for most DIY mechanics.

• Difficulty Rating: 2 out of 5
• Estimated Time: 0.5 - 1 hour
• DIY Feasible: Yes

The basic process involves waiting for the engine to cool completely, placing a drain pan underneath, partially draining the radiator, using pliers to release the hose clamps at both ends, removing the old hose, installing the new one, and then refilling and bleeding the cooling system 🎬 Watch: How to replace a blown radiator hose of any air pockets. Always use Honda's recommended blue Type 2 coolant.

Cost Comparison

Frequently Asked Questions (FAQ)