Radiator for Chevrolet Blazer (1987-1991) 5.7L

Heavy-Duty 3-Row Aluminum Radiator for 1987-1991 Chevrolet Blazer (K5)

What it Does: The 3-row aluminum crossflow radiator replaces the failure-prone factory heat exchanger on the 1987-1991 Chevrolet Blazer to maximize thermal dissipation, lower operating temperatures, and prevent chronic engine overheating under load.

The Stock Chevrolet Blazer Cooling Deficiencies

Factory cooling systems on the squarebody K5 Blazer rely on aging copper-brass or crimped composite end tanks that deteriorate after decades of thermal cycling. Torsional chassis flex during off-road operation stresses the factory core seams, while internal corrosion and mineral scale build-up severely reduce heat rejection. Under sustained load—such as trailer towing or low-speed crawling—the OEM cooling capacity quickly becomes overwhelmed, subjecting the 5.7L LO5 SBC engine to chronic heat soak and elevated coolant temperatures.

The Engineering Solution

This cooling assembly utilizes a premium all-aluminum 3-row crossflow core measuring 28.23 x 18.82 x 2.44 inches, precision TIG-welded to heavy-gauge aluminum tanks to eliminate leaky mechanically crimped joints. Louvered multi-fin engineering dramatically expands surface-area thermal contact compared to stock radiators, speeding up convection under low airflow conditions. Designed with an integrated transmission fluid cooler, 1.50-inch inlet/outlet bungs, and an included pressure-rated radiator cap, this drop-in replacement ensures optimal drivetrain fluid stabilization and robust cooling efficiency.

What's Included

• 1x 3-Row Full Aluminum Crossflow Radiator
• 1x Radiator Cap

Technical Specifications

Compatibility

• 1987-1991 Chevrolet K5 Blazer 5.7L V8
• 1987-1991 Chevrolet V1500 Blazer 5.7L V8

Frequently Asked Questions & Fitment Warnings

Does this fit the K5 Blazer?

Yes, this is a direct fit for the 1987-1991 Chevrolet Blazer equipped with the 5.7L LO5 V8 engine.

Does this radiator accommodate automatic transmission lines?

Yes, it features an integrated internal transmission oil cooler engineered to plumb directly into factory automatic transmission lines.

The Chevrolet Truck Standard

Built for demanding trails and heavy hauling, the K5 Blazer requires heavy-duty thermal management. Upgrading to a rigid, fully TIG-welded all-aluminum core provides the extended durability and thermal capacity needed to protect your Small Block Chevy through extreme towing and harsh off-road duty.