How to Buy the Right Peterbilt 379 Radiator

If you want to keep your diesel engine from overheating you need a well-functioning replacement Peterbilt radiator to properly carry the hot coolant through small passages, transfer engine heat into the air, and return cooled fluid to the engine.

7 Factors to Consider Before Buying a Peterbilt Radiator

1. Correct Fitment
2. Cooling Capacity
3. Core Construction
4. Airflow/Core Design
5. Durability
6. Serviceability
7. Price

Peterbilt 379 Radiator Fitment Identification

The 2006 Manufacturer Change

Back in 2006, Peterbilt changed the radiator mount position to center mount instead of an offset mount.

Ordering a standard 379 Peterbilt radiator for the 2006 model means the fan-to-radiator clearance won’t be enough.

Before you buy, verify:

• Bottom mounting and bolt pattern
• Radiator mounting position
• Engine
• Remote versus radiator-mounted surge tank
• Side bracket/channel design
• Core dimensions
• OEM or cross-reference number when available

Reversible lower connection: Some replacement Peterbilt 379 radiators feature a reversible or repositionable lower coolant connection. This lets you configure the lower hose outlet for the driver or passenger side, depending on the truck's original setup. Always follow the radiator manufacturer's instructions when changing the connection orientation.

Aftermarket Replacement Radiator Options

Once it goes bad, there are plenty of replacement Peterbilt radiators to choose from.

BESTfit heavy-duty radiators encompass the gambit of premium radiator kits and economical aluminum radiator replacements.

The absolute cheapest brands are going to be from China, like RAYTEN radiators.

The luxury price points are found with US-based brands like PDI Big Boss Performance and CM Compressor A/C radiators which start at $3,000 and stretch towards $8,000 per unit.

Radiator Core Features That Affect Cooling

Radiator Components Explained

Radiator Fin Count

Most standard heavy-duty radiator cores use 16 to 18 fins per inch. It varies a lot by the brand/manufacturer.

More fins will help shed heat into the air, but they also increase airflow resistance and there is more opportunity for bugs, dirt, and debris to collect between the fins.

High-Efficiency Radiator Cores

An efficient radiator core helps to remove heat from the engine coolant through the tubes and fins.

Some radiator tubes use internal dimples or turbulators. These designs disrupt the speed of the coolant flow, giving it more time to cool down.

This is great for operating in high heating areas, running sustained engine loads, or climbing long, steep grades.

Radiator Rows

The rows are the number of coolant-tube layers running through the depth of the radiator core.

More rows means more room for additional coolant tubes and a broader heat-transfer surface area.

Higher row count doesn’t equate to stronger cooling capacity.

The radiator’s core geometry and operating conditions determine the engine cooling power.

Air gets hotter as it travels through the radiator – the first row getting the coldest air, the each subsequent row getting increasingly warmer air.

• 2 Rows: common in wide-tube aluminum designs, featuring lower weight and less airflow.
• 3 Rows: standard on most heavy-duty trucks due to balance of core depth and air flow.
• 4 Rows: heavy-duty copper-brass Peterbilt configurations
• 5 Rows: more depth and weight for older or high-load designs.
• 6+ Rows: specialized or severe-duty construction.

For most drivers, 3-rows work just fine. Here's why. 

Crystal Miller drives a Peterbilt 379 model that she calls Whitey, which is spec’d at 650hp for pre-emissions 6NZ Caterpillar engine.

Like most big trucks that come straight out of the factory, it has a 3-core radiator setup. 

She pulls over 175,000 pounds up steep mountain climbs across the American West Coast with ZERO overheating issues.

Choosing a Radiator Type

Aluminum vs Copper-Brass

Aluminum is lightweight and affordable, common on most big rigs. 

Copper-brass is heavier, more expensive, and long-lasting - ideal for vocational applications and vintage big rigs that endure long-haul drives. 

For long-haul trucking, both function just fine. 

Replacing Related Radiator Cooling Hardware

If you’re replacing a radiator set, it’s important to maintain the entire cooling system.

Vibration, heat cycles, restricted airflow, and poor coolant pH levels don't just wear down the radiator, but also related engine-cooling parts:

• Mounting Components
• Hoses
• Connections
• Coolant Pressure
• Coolant pH Levels
• Fan Shrouds
• CAC/Condenser
• Clamps
• Hoses
• Surge Tank
• Caps

How to Maintain Your Radiator

Preserve your radiator by simply washing it off.

Every so often, remove the radiator, hose off the bug guts, sludge, and debris, and re-insert it.

This simple habit helps preserve the radiator for longer work cycles.

Shop Peterbilt Engine-Cooling Truck Parts at 4 State Trucks

Filter for your specific make/model/year and find a wide availability of in-stock semi truck parts to keep your engine's cooling system well-maintained for years to come.