A-Premium Radiator Coolant Expansion Reservoir Overflow Tank w/ 15 PSI Cap & Sensor, GM Trucks/SUV Fit

A-Premium Radiator Coolant Expansion Reservoir Overflow Tank is a direct-replacement pressurized coolant recovery tank with cap and sensor designed to restore proper cooling system function on compatible GM trucks and SUVs. This replacement overflow tank is built from heat-resistant PA plastic, includes a spring-loaded twist cap rated to 15 PSI, a pre-installed sensor, and mounting features sized to match original equipment for a straightforward swap. It’s engineered to integrate with the factory cooling system, collect excess coolant during thermal cycling, and return fluid to the radiator when the engine cools. The product ships with the reservoir, cap, sensor, and tubing required for installation.

Which vehicles will accept this A-Premium reservoir?

This tank is manufactured to fit a wide range of General Motors full-size trucks and SUVs from the late 1990s through the 2000s. Confirm compatibility using your vehicle’s Year/Make/Model selector before purchase or cross-reference the listed reference numbers.

• Cadillac Escalade 2002–2006
• Chevrolet Avalanche/Silverado/Suburban/Tahoe 1999–2006 (varies by model)
• GMC Sierra/Yukon/Yukon XL 1999–2006
• Hummer H2 2003–2009

How does the cap, sensor, and pressurization affect cooling performance?

The included spring-loaded twist cap holds system pressure up to 15 PSI, which raises coolant boiling point and helps maintain stable circulation under load. The sensor enables the vehicle’s monitoring system to detect fluid level changes so you can address leaks or low-coolant conditions promptly. Together they help the cooling system operate within designed conditions without requiring additional parts.

• 15 PSI cap increases boil-over resistance
• Sensor provides factory-style level monitoring
• Pressurized design supports correct coolant flow and recovery
• Comes preassembled with tubing to simplify hookup

What are the construction and installation details I should know?

The reservoir is molded from durable PA plastic chosen for heat and vibration resistance, and it uses two factory-style mounting points for a secure fit. The kit includes one reservoir, the pressure cap, one sensor, and necessary tubing so most DIYers can complete the replacement with basic hand tools. Always compare reference numbers and mounting geometry to your original tank before starting work.

• Material: heat-resistant polyamide (PA) plastic
• Mounting holes: two factory-style attachment points
• Package includes reservoir, cap, sensor, tubing
• Check reference numbers: 603-102, 19353731, GM0713009, etc.

What warranty and buyer protections come with this replacement tank?

A-Premium backs this engine coolant overflow tank with a one-year unlimited-mileage guarantee, covering manufacturing defects under normal use. If the product arrives damaged or fails under covered conditions, the warranty process provides a path for replacement or refund through the seller’s support channels. Keep purchase details and part references handy when contacting support.

• One-year unlimited-mileage warranty from A-Premium
• Replacement or support available through seller channels
• Verify fitment using Year/Make/Model selector before purchase
• Save receipts and part reference numbers for warranty claims

Who is this for: If you own a compatible Chevrolet, GMC, Cadillac, or Hummer from the specified model years and you’re replacing a cracked, leaking, or non‑functional coolant overflow tank, this A-Premium assembly is a direct-fit replacement that restores pressurization and level-sensing capability. It’s aimed at owners who want an OEM-style swap that includes cap, sensor, and tubing, whether you’re a DIY mechanic doing a one-day repair or a shop performing routine cooling-system maintenance.

FAQ

Q: Will this reservoir fit my Silverado 1500 from 2003?

A: Yes—A-Premium lists direct compatibility with Silverado 1500 models from 1999–2006, but confirm with your Year/Make/Model selector before ordering.

Q: Does the kit include the pressure cap and sensor?

A: Yes, the package includes the reservoir, a 15 PSI spring-loaded cap, the sensor, and tubing for installation.