Radiator

Note: Will fit all trim packages including Grand Sport and ZR-1

Complete aluminum radiator assembly with no plastic end tanks or rubber gaskets
Base model single core radiator available with 1-1/2-inch wide core tube
Two core radiator option with dual 1-inch-wide core tubes for maximum cooling
Optional LS swap radiator with dual 1-inch-wide core tubes available as well
Press formed end tanks fully welded to core with no gaskets or epoxy construction
25-inch factory-sized cooling hose inlet and outlet connections to use stock hoses
LS conversion radiator fitted with 1.25-inch inlet and 1.50-inch outlet connections
Direct Fit® upgrade means just that, with no modifications needed to your Corvette
Radiators are 100 percent manufactured in the U.S.A. with a lifetime warranty
Increased coolant capacity on all models without fitment issues
Serpentine cooling fins deliver optimum airflow across core tubes for cooling
Built-in OE-style transmission oil coolers on applicable models
Optional 11-inch dual electric cooling fan package with 2,720 cfm airflow available
Black Ice two-part epoxy coating available on single row and Pro Series models
Controlled atmosphere furnace brazed core with TIG welded end tanks
Factory-style 5/16-inch inverted flare fittings on auto trans cooler equipped models

America’s Sports Car Deserves the Best Aluminum Radiator Upgrade

Corvettes do many things quite well. From hot lapping the drag strip to stretching its legs on the road course, or even taking in a cross-country road trip, the Corvette has the power, handling, braking, and comfort to handle anything you can throw at it. That is until you notice the temp gauge climbing, that sweet tattle tale whiff of coolant, and steam exiting your hood gaps when the stock cooling system is overwhelmed by aftermarket high performance upgrades.

With the radiator design GM used on the C4 Corvette, like many designs on the road today, product costs and installation methods on the assembly line dictate the product and its compromises. An aluminum radiator core with injection molded plastic end tanks that are crimped to the core, sealed with a giant O-ring, means Chevrolet’s Corvette befalls the same issues as most vehicles using a similar radiator design when asked to do more than it was designed for.

While this design saves weight and allows mounts to be molded into the tank, saving the cost of additional bracketry to secure the radiator, the vibration felt throughout the chassis from powerful engine upgrades and extended hard driving puts a lot of strain on these mounting points, creating cracks, and the harmonics/twisting motion creates leaks at the crimping point of the plastic end tanks. A lack of cooling system service creates failure points too. Solve these issues with a DeWitts Direct Fit® performance aluminum C4 Corvette radiator upgrade.

Built to Fit Your Corvette with Zero Modifications to Install

We get it, the injection molded end tanks save money and are easy to manufacture while handling the Corvette’s stock cooling needs, but that’s not how we do things with DeWitts radiators. Our Direct Fit® C4 Corvette radiator options are built using the highest quality aluminum materials, assembled, furnace brazed, and TIG welded all in our Wixom, Michigan facility (just 30 mins up I-96 from GM’s corporate headquarters at the Renaissance Center). Each DeWitts C4 radiator carries a limited lifetime warranty, is pressure tested, and carefully double wall boxed with insulation to ensure it makes the trip to you and keeps your project moving forward.

Our press formed end tanks mean you won’t have any fitment issues and your factory cooling hoses, transmission cooler lines, fan shroud, and more will all connect right up without modification to our C4 radiator. Flat plate welded end tanks that our competitors use rarely have this luxury, requiring modifications to your car to fit the larger tanks and/or additional bracketry or adapters to refit your stock components. Using a two-row core built with 1-inch-wide core tubes (1-1/2-inch wide tubes on our single core base model radiator) and serpentine cooling fins maximizes air flow contact through the core to pull away the most heat, no matter the demand on the system, while increasing coolant capacity by up to one gallon over the stock single row core.

Automatic transmission-equipped models feature a traditional internal cooler with OE-style 5/16-inch inverted flare fittings. Our Black Ice two-part epoxy coating is a semi-gloss black finish that provides an OE-like look for those that want to keep things low key under the hood.

C4 Corvette Standard, Pro Series, and LS Swap Direct Fit® Radiator Options

Our C4 Corvette radiator upgrades start with our 32-1129090M DeWitts standard single row radiator with 1-1/2-inch wide core tube for models with manual transmissions. These radiators provide 50 percent additional cooling surface area and additional coolant capacity via full size end tanks, while maintaining stock fitment at an excellent value. Our Pro Series models upgrade to dual 1-inch core tubes with the same full size end tanks, providing a full gallon increase in coolant capacity. Lastly, our LS swap models utilize the same dual 1-inch core tubes as our Pro Series, but in a double pass configuration to provide the proper LS inlet and outlet locations on the passenger side. We also provide the proper LS steam port fitting welded into the tank as well. Depending upon application needs we provide the correct end tank configurations for hassle free connection to factory coolers and mounting points.

Our optional C4 Corvette Cooling Fan Upgrades feature dual 11-inch fans and flows 2,760 cfm of air. These fan kits are available for our two row Pro Series radiators and single row standard radiators. Finally, be sure to add some DeWitts High Performance coolant to your order to protect your cooling system and help it achieve maximum thermal capabilities.

DeWitts Radiator Application Guide:

1990-1996 Corvette OE-Style

32-1129090M (single row Direct Fit®, natural finish, manual trans)

32-1129090A (single row Direct Fit®, natural finish, automatic trans)

32-1229090M (single row Direct Fit®, Black Ice finish, manual trans)

1990-1996 Corvette Pro Series

32-1139090M (Pro Series two row Direct Fit®, natural finish, manual trans)

32-1139090A (Pro Series two row Direct Fit®, natural finish, automatic trans)

32-1239090A (Pro Series two row Direct Fit®, Black Ice finish, automatic trans)

32-1139090E (Pro Series two row Direct Fit®, natural finish, engine oil cooler)

Note 1: For Pro Series models the two upper rubber cushions must be trimmed slightly to accommodate the larger core. Spacer plates and hardware are included so no shroud cutting is required.

Note 2: 32-1139090E with engine oil cooler is by special order and must call to order. Requires user sourced cooler lines and fittings

1990-1996 Corvette LS Swap

32-3139090M (LS swap Direct Fit®, dual pass, natural finish, manual trans)

32-3139090A (LS swap Direct Fit®, dual pass, natural finish, automatic trans)

Specifications

	Original Equipment	Single Row	PRO Series Two Row	LS Swap
Radiator Style:	Single Pass	Single Pass	Single Pass	Multi-Pass
Radiator Flow Direction:	Crossflow	Crossflow	Crossflow	Crossflow
Material Type:	Plastic	Aluminum	Aluminum	Aluminum
Inlet Location:	Upper Drivers Side	Upper Drivers Side	Upper Drivers Side	Upper Passenger Side
Outlet Location:	Lower Passenger Side	Lower Passenger Side	Lower Passenger Side	Lower Passenger Side
Row Quantity:	Single	Single	Double	Double
Cooling Tube Size:	1.00	1.50”	1.00”	1.00”
Core Width:	23.625”	23.50”	23.50”	23.50”
Core Height:	15.00”	16.50”	16.50”	16.50”
Overall Width:	28.50”	28.50”	28.50”	28.50”
Core Thickness:	1.50”	1.50”	2.25”	2.25”
Overall Thickness:	2.00”	3.00”	3.00”	3.00”
Overall Height:	17.00”	17.00”	17.00”	17.00”
Inlet Size:	1.5”	1.5”	1.5”	1.5”
Outlet Size:	1.75”	1.75”	1.75”	1.75”
Cap Included:	No	No	No	No
Finish:	Natural	Natural	Natural or Black	Natural
Internal Trans Cooler:	Yes	Yes	Yes	Yes
BTU/M Rating:	3545		5151	5151
Low Coolant Sensor Port:	No	No	No	No
Cooler Thread Size:	5/16” Inverted Flare	5/16” Inverted Flare	5/16” Inverted Flare	5/16” Inverted Flare

OE Fan Upgrade

Model: SP461

Boost air-flow on your C4 with this dual fan package. The kit includes the SPAL dual 11-inch fans (2,720 cfm) and mounting brackets. The brackets are designed to bolt directly in place of the original fan package. Note the AC accumulator can must be relocated. This kit is for use with our Direct Fit® double row PRO Series or LS Swap radiators. See SP462 for factory single row radiators.

Model: SP462

This is an upgrade to the original GM fan with brackets designed to bolt directly in its place. Similar to the double row fan kit, this package includes the SPAL dual 11-inch fans (2,720 cfm) and mounting brackets to fit the factory radiator. The wiring is ready to plug in and go. The Note the AC accumulator can must be relocated.

Specifications:

	11-Inch Dual SPAL Fan
Blade Diameter:	11.00"
Blade Orientation:	Paddle
Overall Width:	23.46"
Overall Height:	16.26"
Fan Thickness:	4.25"
# of Blades:	5 per side
Color:	Black
Material:	Plastic
Push/Pull	Pull

1990-1996 Corvette Direct Fit®

1990-1996 Corvette Direct Fit®