PYHAUTO Coolant Reservoir Tank for 1999-2006 Silverado 1500 & Sierra 1500 — Direct-Fit Replacement with Cap

Replacement PYHAUTO coolant reservoir tank engineered to restore overflow and coolant level control for 1999–2006 Chevrolet Silverado 1500 and GMC Sierra 1500 models.

This PYHAUTO coolant expansion tank is a direct-fit aftermarket replacement designed to match the original equipment shape and mounting points used on select GM trucks and SUVs from the late 1990s through 2006. Built from durable materials and supplied with a cap, the tank addresses cracked or leaking OEM reservoirs and helps you bring coolant containment back to factory-style operation without extensive modification.

Will this tank fit my truck?

Yes — the PYHAUTO reservoir is molded to fit the same mounting locations and hose connections used by many GM models. Confirm compatibility by checking your vehicle year and part numbers before ordering.

• Compatible with Chevrolet Silverado 1500 and GMC Sierra 1500 (1999–2006).
• Also suitable for Tahoe, Suburban 1500, Yukon, Escalade, Avalanche and Hummer H2 where the same OEM part is specified.
• Cross-references include part numbers like 15203949, 19353731, 10188034 and others listed for verification.

How does this compare to the original equipment tank?

This aftermarket unit follows the OEM contour and connection layout so you get the same fit and function without paying dealership prices. Materials and cap sealing are selected for long service life and resistance to normal engine-bay stresses.

• OEM-style geometry for straightforward installation and correct hose alignment.
• Constructed from high-quality plastic to resist heat and vibration.
• Supplied complete with a cap to restore proper pressure and overflow control.

What should I expect during installation?

Installation is typically a simple bolt-and-hose swap that most DIYers with basic tools can complete in under an hour. Ensure the engine is cool before removing coolant lines and follow safe fluid disposal procedures.

• Remove old reservoir, disconnect hoses and mounting bolts, then transfer or replace cap and sensors as needed.
• Bleed or top up coolant per your vehicle service manual after installation.
• Check for leaks and proper fill level during initial run and after a short test drive.

What after-sales support and assurances are included?

PYHAUTO backs this reservoir with a one-year warranty to cover manufacturing defects, giving you reassurance after purchase. If any fit or quality questions arise, customer support is available to assist with returns or guidance.

• One-year warranty for peace of mind against defects.
• Seller support for fitment questions or replacement guidance.
• Packaged to prevent shipping damage and reduce installation surprises.

Who is this for: This PYHAUTO reservoir tank is aimed at owners and independent repair shops working on late‑1990s to mid‑2000s GM full-size trucks and SUVs who need a reliable, cost-effective replacement for a cracked, warped, or leaking coolant overflow tank. It’s ideal if you want an OEM‑style fit without dealership pricing, a straightforward swap for common models like Silverado 1500 or Sierra 1500, and a backed product with a limited warranty.