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.

Shop by Subcategory

• 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.