KAX CU13129 Engine Radiator Replacement Compatible with Ram

In this review the KAX CU13129 engine radiator replacement is presented for owners of various Ram 1500, 1500 Classic, 2500 and 3500 trucks who need a direct-fit cooling solution. The bottom line: this radiator is aimed at technicians and DIYers who want a near-OE fit and strong cooling performance because it uses an aluminum core with multi-louver fins and high-grade plastic tanks. It is notable for its compatibility across many model years and for offering a practical two-year warranty and clear fitment guidance in the product listing.

Key Features

• Perfect fit: Covers a wide range of Ram 1500, 1500 Classic, 2500 and 3500 model years so buyers can find a close match to their original radiator without major modifications.
• OE numbers & specifications: Matches several original equipment part numbers, which helps ensure the radiator aligns with factory mounting points and plumbing.
• High efficiency core: High-density multi-louver fins and an aluminum core increase heat dissipation area for improved cooling under load.
• Durable construction: High-grade plastic water tanks and corrosion-resistant materials reduce the likelihood of premature failure in typical driving conditions.
• Tested reliability: Each unit is pressure tested, leak-proof tested and stress tested under durability procedures to meet IATF16949 quality standards.
• Reinforced packaging: Shockproof multi-layer packaging with foam corner protection lowers the risk of transport damage on delivery.

Who It's For

This radiator is best for Ram owners who need a straightforward replacement for 2011-2017 1500/2500/3500 and 2019-2023 1500 Classic variants, especially those replacing a damaged or failing core and seeking an affordable, near-OE alternative. It will appeal to professional installers and capable DIY mechanics who can confirm fitment and handle installation.

It is less appropriate for owners who require factory-original branded parts for warranty reasons, or for vehicles with custom cooling upgrades where a higher-capacity or bespoke radiator is desired. Also, buyers uncertain about exact model-year compatibility should verify vehicle fitment before purchase.

Pros & Cons

Pros

• Good fit for many Ram model years and engine variants, reducing installation hassle.
• Effective cooling design with aluminum core and multi-louver fins for better heat transfer.
• Value-oriented option with a two-year quality assurance and comprehensive after-sales support.
• Well packaged for shipment to avoid transit damage.

Cons

• Build quality feedback is mixed; some buyers reported concerns with transmission cooler fittings.
• There are isolated reports of leakage, so careful pre-install inspection and pressure testing after install are recommended.

Specifications

Core Thickness	1 in
Core Width	27-1/2 in
Core Height	22 in
Inlet Diameter	1-1/2 in
Outlet Diameter	1-3/4 in
OE Part Numbers	55056858AB/AC/AD/AE, 55056870AA-AF, 55056972AB, CU13295

Our Verdict

The KAX CU13129 is a practical, value-focused replacement radiator for many Ram 1500, 1500 Classic, 2500 and 3500 applications, offering solid cooling performance and a two-year warranty. It is recommended for owners seeking a near-OE fit and good thermal efficiency, but those who need factory-branded exact matches or who worry about occasional fitting or leak reports should proceed with fitment confirmation and careful inspection.

Frequently Asked Questions

Will this radiator fit my Ram 1500?
Confirm exact year and engine variant against the compatibility list and the vehicle fitment tool provided by the seller before purchasing.

What are the inlet and outlet sizes?
The radiator uses a 1-1/2 in inlet and a 1-3/4 in outlet as specified in the product details.

Does it come with a warranty?
Yes, the manufacturer provides a two-year quality assurance and after-sales support for this radiator.