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COOLING SYSTEM — 1994–1998 DODGE RAM 5.9L CUMMINS (12-VALVE, P7100)

Keep your Second-Gen 12-valve running cool with CPP Diesel’s curated selection of radiators, water pumps, thermostats, silicone hose kits, fan clutches, dual electric fans, coolant bypass solutions, reservoirs, and block heaters—all chosen for 1994–1998 Dodge Ram 2500/3500 fitment and reliability.

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Thermostats & Seals — Cummins 180° (3934373), Cummins 180° (3928499), seal 3925466, housing CPP 12V housing.
Water Pumps & Gaskets — CPP water pump, O-ring 3906698.
Radiators — Mishimoto MMRAD-RAM-94.
Hoses & Kits — Mishimoto silicone kits, CPP black silicone kit (94–98).
Fans, Clutches & Controllers — CPP fan clutch, CPP 103961 dual electric fans.
Coolant Bypass (Even Cylinder Temps) — Fleece 12V kit (94–98).
Reservoirs & Caps — CPP coolant reservoir, caps Dorman 54201.
Cold-Weather & Hardware — Block heater 3916127, freeze/frost plug solutions in the 94–98 Cooling System.
Transmission Cooler (Tow/Work) — Mishimoto MMTC-RAM-94SL.

Featured 94–98 Picks

Mishimoto Aluminum Radiator (MMRAD-RAM-94) — heavy-duty cooling for towing and heat.
CPP 103961 Direct-Fit Dual Fans — airflow boost with shroud, 94–02 fit.
CPP Cooling Fan Clutch — OE-style reliability for 90–98.
Mishimoto Silicone Hose Kit — durable multi-ply silicone, color options.
Fleece 12V Coolant Bypass — helps stabilize rear-cylinder temps at RPM.

Why Buy from CPP Diesel

Second-Gen Focus: Parts vetted on 1994–1998 P7100 trucks for fit and durability.
Top Brands: Cummins, CPP, Mishimoto, Fleece, Dorman—plus curated hardware.
Expert Support: Thermostat selection (180° OE vs. alt temps), radiator and fan sizing, hose routing.
Fast Shipping: Popular 12-valve components ship quickly from U.S. warehouses.

Browse the full 1994–1998 Cummins catalog, or pair cooling upgrades with intercoolers/boost tubes and gauges for safe EGTs.

Helpful Notes

Thermostat baseline: Most 12-valve trucks run a 180° stat; verify with VIN and choose the proper seal/housing.
Hoses: Replace aged rubber with multi-ply silicone; recheck clamps after heat cycles.
Airflow: A healthy mechanical clutch fan works for most—dual electrics help at idle/slow trailering.
Bypass kits: Useful on higher-RPM builds to equalize cylinder temps.
Cold weather: Block heaters and correct coolant mix ease winter starts and reduce wear.

Frequently Asked Questions

Is 180°F the correct thermostat temp for my 12-valve?

Yes—180°F is the common OE spec on 1994–1998 5.9L. We stock Cummins 3934373 and 3928499 plus the proper seal and housing.

Do I need a coolant bypass on a stock truck?

Not usually. It’s most beneficial on higher-RPM or performance setups—see the Fleece 12V kit.

Mechanical clutch fan or dual electric fans?

For daily/tow rigs, a good clutch fan is proven. If you need more idle-speed airflow or packaging benefits, use CPP 103961 dual fans.

Which radiator fits 1994–1998?

Mishimoto MMRAD-RAM-94 is a direct-fit aluminum upgrade that covers 1994–2002 5.9L applications.

What else should I replace during cooling service?

Consider a new pump O-ring, fresh hoses, and inspect the reservoir and cap.

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FLEECE FPE-CUMM-SSHCL-12V REPLACEMENT HEATER CORE LINE KIT FOR 89-98 12 VALVE CUMMINS

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FLEECE FPE-34574-A UNIVERSAL PRE-FORMED 5/8 INCH COOLANT HOSE WITH 90 DEGREE ENDS

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FLEECE FPE-34258-A UNIVERSAL PRE-FORMED 5/8 INCH COOLANT HOSE WITH 90 DEGREE ENDS AND T-FITTING (1 INCH ID ON THE T)

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FLEECE FPE-34257-A UNIVERSAL PRE-FORMED 5/8 INCH COOLANT HOSE WITH 90 DEGREE ENDS AND T-FITTING

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FLEECE FPE-CLNTBYPS-CUMMINS-12V-SS CUMMINS COOLANT BYPASS KIT 12V 94-98 WITH STAINLESS STEEL BRAIDED LINE

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FLEECE FPE-CLNTBYPS-HS-12V-BLK 39.50 INCH 12 VALVE CUMMINS COOLANT BYPASS HOSE BLACK NYLON BRAIDED

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FLEECE FPE-CLNTBYPS-HS-12V-SS 39.50 INCH 12 VALVE CUMMINS COOLANT BYPASS HOSE STAINLESS STEEL BRAIDED

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FLEECE FPE-CLNTBYPS-CUMMINS-12V 12V COOLANT BYPASS KIT 1994-1998

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BD DIESEL 1030607 UNIVERSAL ELECTRIC COOLING FAN KIT 80-WATT 10 INCH 800 CFM C/W UNIVERSIAL MOUNTING KIT

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BD DIESEL 1040022 CUMMINS KILLER FROST PLUG PLATE DODGE 1989-2002 5.9L CUMMINS

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CPP DIESEL COOLING FAN CLUTCH FOR 1990-1998 DODGE RAM WITH 5.9L CUMMINS ENGINE

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CPP ALUMINUM 3 ROW RADIATOR FOR 1994-2002 DODGE RAM WITH 5.9L CUMMINS ENGINE

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CPP DUAL RADIATOR FAN WITH SHROUD FOR 1994-2002 DODGE RAM WITH 5.9L CUMMINS ENGINE

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CPP REPLACEMENT HEATER CORE LINE KIT FOR 89-98 12 VALVE CUMMINS

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CPP PRE-MADE BRAIDED FUEL, OIL AND COOLANT HOSES MADE TO ORDER

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INDUSTRIAL INJECTION PDM-07001 DODGE FREEZE PLUG SIDE PLATE FOR 89-02 CUMMINS

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CPP BILLET REAR FREEZE PLUG FOR 1989-2002 DODGE RAM WITH CUMMINS 5.9L ENGINE

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INDUSTRIAL INJECTION PDM-08208 DODGE FREEZE PLUG RETAINING PLATE FOR 89-02 CUMMINS 12 AND 24 VALVE

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MOPAR 52028760 COOLING FAN CLUTCH FOR 90-98 DODGE WITH 5.9L CUMMINS ENGINE

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Now: $365.05

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MOPAR 52027827 UPPER RADIATOR ISOLATOR MOUNT FOR 97-07 DODGE WITH 5.9L CUMMINS ENGINE

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MOPAR 4638682 ENGINE BLOCK HEATER FOR 89-98 DODGE WITH 5.9L CUMMINS ENGINE

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CPP DIESEL RADIATOR DRAINCOCK VALVE FOR 1997-2009 DODGE RAM WITH CUMMINS 5.9L/6.7L ENGINE

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DORMAN 555-024 STEEL CUP EXPANSION PLUG - 1-1/4" (1.25") (QTY 10) 1989-2005 DODGE 5.9L DIESEL

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DORMAN 54203 COOLANT RESERVOIR CAP 1990-2010 DODGE RAM

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DORMAN 76829 HVAC CONTROL KNOBS 1994-1997 DODGE RAM 2500/3500

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DORMAN 54201 COOLANT RESERVOIR CAP 1994-2010 DODGE RAM 2500/3500 | 1990-1993 DODGE D/W 250/350

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CPP DIESEL STEEL CLUTCH FAN BLADE FOR 1989-2002 DODGE RAM WITH 5.9L CUMMINS ENGINE

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CPP DIESEL COOLANT RESERVOIR FOR 1994-2002 DODGE RAM WITH 5.9L CUMMINS ENGINE

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CPP DIESEL UNIVERSAL 10IN ELECTRIC 1750 CFM COOLING FAN KIT

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CPP 3906698 WATER PUMP SEALING O-RING FOR 89-18 DODGE CUMMINS 5.9L/6.7L 12V/24V

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FLEECE FPE-CUMM-SSHCL-12V REPLACEMENT HEATER CORE LINE KIT FOR 89-98 12 VALVE CUMMINS
Replace your leaking or corroded heater tubes with our upgraded stainless steel tubes and high temperature silicone hose kit from Fleece Performance. This kit contains everything you need to replace your heater lines from the block to the firewall. This...

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FLEECE FPE-34574-A UNIVERSAL PRE-FORMED 5/8 INCH COOLANT HOSE WITH 90 DEGREE ENDS
Universal fit, preformed 5/8 inch ID hose with 90 degree ends. Create clean routings and installations with this preformed coolant hose. See graphic for detailed dimensions. Upgrade your vehicle's cooling system with the FLEECE FPE-34574-A Universal...

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FLEECE FPE-34258-A UNIVERSAL PRE-FORMED 5/8 INCH COOLANT HOSE WITH 90 DEGREE ENDS AND T-FITTING (1 INCH ID ON THE T)
Universal preformed 5/8 inch hose with 90 degree ends and T-fitting (1 inch ID on the T). Create clean routings and installations with this preformed coolant hose. See graphic for hose lengths. Experience seamless routing and installation with the...

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FLEECE FPE-34257-A UNIVERSAL PRE-FORMED 5/8 INCH COOLANT HOSE WITH 90 DEGREE ENDS AND T-FITTING
Universal preformed 5/8 inch hose with 90 degree ends and T-fitting. Create clean routings and installations with this preformed coolant hose.The FLEECE FPE-34257-A Universal Pre-formed Coolant Hose is designed to revolutionize your engine's cooling...

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FLEECE FPE-CLNTBYPS-CUMMINS-12V-SS CUMMINS COOLANT BYPASS KIT 12V 94-98 WITH STAINLESS STEEL BRAIDED LINE
Increased Coolant Flow, Decreased Coolant Temperatures. The rear cylinders on the 5.9/6.7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling...

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FLEECE FPE-CLNTBYPS-HS-12V-BLK 39.50 INCH 12 VALVE CUMMINS COOLANT BYPASS HOSE BLACK NYLON BRAIDED
39.50 inch 12 Valve Cummins Coolant Bypass Hose (Black Nylon Braided)The FLEECE FPE-CLNTBYPS-HS-12V-BLK 39.50 Inch 12 Valve Cummins Coolant Bypass Hose is the ultimate solution for anyone seeking top-notch performance and durability in their cooling...

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FLEECE FPE-CLNTBYPS-HS-12V-SS 39.50 INCH 12 VALVE CUMMINS COOLANT BYPASS HOSE STAINLESS STEEL BRAIDED
39.50 inch 12 Valve Cummins Coolant Bypass Hose - Stainless Steel BraidedThe FLEECE FPE-CLNTBYPS-HS-12V-SS 39.50 inch 12 Valve Cummins Coolant Bypass Hose is engineered for durability and high performance. With its stainless steel braided construction,...

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FLEECE FPE-CLNTBYPS-CUMMINS-12V 12V COOLANT BYPASS KIT 1994-1998
Increased Coolant Flow, Decreased Coolant Temperatures The rear cylinders on the 5.9/6.7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling...

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BD DIESEL 1030607 UNIVERSAL ELECTRIC COOLING FAN KIT 80-WATT 10 INCH 800 CFM C/W UNIVERSIAL MOUNTING KIT
80-watt, 10-inch, 800 CFM universal electric fan. The fan is supplied as a pusher fan from factory which will draw air in through the grille of the fan and push that air into the radiator. This is ideal for installation on the front side of the vehicles...

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BD DIESEL 1040022 CUMMINS KILLER FROST PLUG PLATE DODGE 1989-2002 5.9L CUMMINS
The coolant pressure inside the engine block can reach 70+psi at high rpm before the thermostat fully opens. This will cause a corroded frost plug to leak. The BD rear frost plug is able to be seal the leak without the need to hammer out the old frost...

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CPP DIESEL COOLING FAN CLUTCH FOR 1990-1998 DODGE RAM WITH 5.9L CUMMINS ENGINE
The CPP Diesel Cooling Fan Clutch is meticulously crafted for Dodge trucks from 1990 to 1998 featuring the robust 5.9L Cummins engine. This essential component plays a critical role in maintaining optimal engine temperatures by intelligently modulating...

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CPP ALUMINUM 3 ROW RADIATOR FOR 1994-2002 DODGE RAM WITH 5.9L CUMMINS ENGINE
The CPP Aluminum 3 Row Radiator offers an exceptional cooling solution specifically designed for the 1994-2002 Dodge Ram equipped with the powerful 5.9L Cummins engine. Meticulously crafted with a full aluminum construction and durable TIG-welded end...

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CPP DUAL RADIATOR FAN WITH SHROUD FOR 1994-2002 DODGE RAM WITH 5.9L CUMMINS ENGINE
The CPP Dual Radiator Fan with Shroud is meticulously designed for the 1994-2002 Dodge Ram equipped with the powerful 5.9L Cummins engine. This high-performance cooling system addresses the crucial task of managing engine temperature, effectively driving...

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CPP REPLACEMENT HEATER CORE LINE KIT FOR 89-98 12 VALVE CUMMINS
Enhance the performance and reliability of your Dodge 12V Cummins engine with the CPP Replacement Heater Core Line Kit, specifically designed for 1989-1998 models. Crafted from high-quality stainless steel, this kit includes everything necessary for a...

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CPP PRE-MADE BRAIDED FUEL, OIL AND COOLANT HOSES MADE TO ORDER
CPP Pre-Made Braided Fuel, Oil, and Coolant Hoses are the ultimate solution for automotive enthusiasts and professionals seeking tailored performance in their vehicles. Crafted with precision, these hoses are custom-made to order for a variety of...

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INDUSTRIAL INJECTION PDM-07001 DODGE FREEZE PLUG SIDE PLATE FOR 89-02 CUMMINS
Cummins 12V 24V and 4BT Freeze Plug Side Plate Industrial Injection is the leading distributor, supplier and remanufacturer of diesel fuel systems, turbochargers, and engines. Your Top Choice for the top diesel products for On/Off highway, industrial,...

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CPP BILLET REAR FREEZE PLUG FOR 1989-2002 DODGE RAM WITH CUMMINS 5.9L ENGINE
The CPP Billet Freeze Plug Retaining Plate is a precision-engineered component tailored specifically for the 1989 to 2002 Dodge Ram with Cummins 5.9L engine models, including the 6B 12 Valve, 24 Valve, and 4BT. Designed to enhance engine performance and...

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INDUSTRIAL INJECTION PDM-08208 DODGE FREEZE PLUG RETAINING PLATE FOR 89-02 CUMMINS 12 AND 24 VALVE
Rear Block Freeze Plug Plate without O-ring. Fits 6B 12 Valve, 98-2002 24 Valve, and 4BT engines Please Read: This freeze plug retaining plate is to be used to prevent the stock freeze plug from coming out. Note: If your freeze plug has already blown out...

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MOPAR 52028760 COOLING FAN CLUTCH FOR 90-98 DODGE WITH 5.9L CUMMINS ENGINE
The Mopar 52028760 Cooling Fan Clutch is a vital component designed for the 1990-1998 Dodge trucks equipped with the powerful 5.9L Cummins engine. Renowned for its exceptional quality and performance, this cooling fan clutch ensures optimal engine...

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MOPAR 52027827 UPPER RADIATOR ISOLATOR MOUNT FOR 97-07 DODGE WITH 5.9L CUMMINS ENGINE
The Mopar 52027827 Upper Radiator Isolator Mount is a vital component designed specifically for 1997-2007 Dodge vehicles equipped with a 5.9L Cummins engine. This upper isolator is an essential part of the cooling system, designed to secure the radiator...

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MOPAR 4638682 ENGINE BLOCK HEATER FOR 89-98 DODGE WITH 5.9L CUMMINS ENGINE
Experience the reliability and performance of the Mopar 4638682 Engine Block Heater, specifically designed for the 1989-1998 Dodge trucks equipped with the powerful 5.9L Cummins engine. This essential accessory provides an efficient solution for ensuring...

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CPP DIESEL RADIATOR DRAINCOCK VALVE FOR 1997-2009 DODGE RAM WITH CUMMINS 5.9L/6.7L ENGINE
The CPP DIESEL 52028466AB Radiator Draincock Valve is an indispensable component for maintaining the cooling systems of select Dodge Ram and Jeep models. Specifically engineered for vehicles featuring 5.9L Cummins engines from 1997 to 2009 and 3.0L...

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DORMAN 555-024 STEEL CUP EXPANSION PLUG - 1-1/4" (1.25") (QTY 10) 1989-2005 DODGE 5.9L DIESEL
This engine expansion plug is designed to match the fit and function of the original part on specified vehicles. Made of quality materials, it is engineered for reliable performance. Direct replacement - this engine expansion plug matches the fit and...

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DORMAN 54203 COOLANT RESERVOIR CAP 1990-2010 DODGE RAM
Cracked or lost the original engine coolant reservoir cap? Replace it seamlessly and effectively with this precisely engineered, direct replacement cap. Direct replacement - this engine coolant reservoir cap directly replaces a cracked or lost original...

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DORMAN 76829 HVAC CONTROL KNOBS 1994-1997 DODGE RAM 2500/3500
The DORMAN 76829 HVAC Control Knobs are the ideal solution for maintaining the functionality and appearance of your 1994-1997 Dodge Ram 2500/3500's heater control system. These control knobs serve as a reliable direct replacement for the original parts,...

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DORMAN 54201 COOLANT RESERVOIR CAP 1994-2010 DODGE RAM 2500/3500 | 1990-1993 DODGE D/W 250/350
The DORMAN 54201 Coolant Reservoir Cap is the perfect solution for replacing a cracked or lost original cap on your 1994-2010 Dodge Ram 2500/3500 or 1990-1993 Dodge D/W 250/350. This precisely engineered cap is designed as a direct replacement, ensuring...

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CPP DIESEL STEEL CLUTCH FAN BLADE FOR 1989-2002 DODGE RAM WITH 5.9L CUMMINS ENGINE
The CPP Steel Clutch Fan Blade is the ultimate solution to the common issue of premature cracking in original equipment clutch fan blades. Specifically designed for 1989-2002 Dodge 5.9L Diesel engines, this OE FIX replacement boasts a sturdy construction...

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CPP DIESEL COOLANT RESERVOIR FOR 1994-2002 DODGE RAM WITH 5.9L CUMMINS ENGINE
The CPP 52004793 Coolant Reservoir for 1994-2002 Dodge 5.9L Diesel vehicles is the perfect solution for engine coolant storage needs. Crafted from high-quality materials, this replacement reservoir is designed to endure the demands of under-the-hood heat...

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CPP DIESEL UNIVERSAL 10IN ELECTRIC 1750 CFM COOLING FAN KIT
Enhance your vehicle's cooling system with the CPP Diesel 10-inch Electric Cooling Fan Kit, delivering a powerful and efficient solution for maintaining optimal engine temperatures. This versatile 80-watt fan is designed as a default "pusher" fan,...

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CPP 3906698 WATER PUMP SEALING O-RING FOR 89-18 DODGE CUMMINS 5.9L/6.7L 12V/24V
The CPP Diesel 3906698 Water Pump O-Ring/Seal is a high-quality sealing O-ring specifically designed for use with 1989-2018 Dodge Cummins 5.9L/6.7L 12V/24V engines. This essential component is crucial for maintaining the integrity and efficiency of your...

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