BDFHYK Engine Coolant Expansion Reservoir for Nissan Altima/Maxima 2002-2006 - OE Fit, Polypropylene Overflow Tank

Keep your Nissan's cooling system reliable with this durable overflow tank engineered to match the original equipment fit and function. Molded from high-quality polypropylene, the reservoir lets you monitor coolant level visually without removing the radiator cap and helps maintain proper pressure and fluid containment in normal operating conditions. It replaces OE numbers 21710-8J000, NI3014105, and related part codes for straightforward compatibility.

Will this reservoir fit my Nissan Altima or Maxima?

This reservoir is designed for specific model years and engine sizes — confirm year, model, and engine before ordering. It fits Nissan Altima model years 2002–2006 (2.5L, 3.5L, V6, L4 configurations listed) and Nissan Maxima 2004–2006 with 3.5L V6 engines when matched to the OE numbers provided.

• Compatible with Nissan Altima 2002–2006 (verify engine code and trim)
• Compatible with Nissan Maxima 2004–2006 3.5L V6
• Matches OE numbers: 21710-8J000, NI3014105, 603-614
• Check pictures and vehicle fitment information before purchase

How does this replacement tank perform compared with the original part?

Manufactured to OE-grade durability, the BDFHYK tank aims to equal the original in strength, fit, and service life. The PP construction resists cracking and chemical degradation, while the molded level viewing area removes the need to open the radiator cap for routine checks.

• OE-standard materials and construction for reliable performance
• Visual coolant level window for quick inspections
• Designed to resist heat, coolant additives, and pressure cycling

What are the installation and maintenance considerations?

Installation is intended to be straightforward; the package includes basic instructions to guide bolt and hose connections. Routine maintenance consists of checking the visible fill level and inspecting hoses and caps for leaks or deterioration; replace hoses if they show cracks or softness.

• Includes installation guidance in the box for DIY or technician fitment
• Inspect hoses, clamps, and cap seals when replacing the tank
• Do not overfill; maintain recommended coolant level for proper expansion room

What materials and quality controls are used in this product?

The reservoir is injection-molded from high-quality polypropylene selected for chemical resistance and dimensional stability. BDFHYK follows factory-style production standards with inspection steps to ensure correct mounting points, fill markings, and leak-free construction.

• Durable polypropylene body resists coolant and engine bay heat
• Engineered to match OEM mounting locations and hose connections
• Quality checks during manufacturing to reduce fitment issues

Who is this for: This replacement coolant expansion tank is aimed at Nissan owners and mechanics who need a reliable, cost-effective OE-grade repair part for Altima (2002–2006) and Maxima (2004–2006) vehicles. It suits DIY enthusiasts comfortable with basic engine-bay work as well as professional shops seeking a compatible substitute that restores proper coolant containment and level visibility. Before buying, verify your vehicle's year, engine, and OE part number to ensure a correct match. For any product concerns, BDFHYK provides customer support with a typical response window within 48 hours.