COOLING SYSTEM — 1989–1993 DODGE RAM 5.9L CUMMINS (12-VALVE)

Keep your first-gen Dodge Ram D250/D350 (1989–1993) running cool with CPP Diesel’s curated selection of radiators, water pumps, thermostats, fan clutches & fans, block heaters, freeze plugs, heater core lines, belt tensioners, and hoses for the VE-pump 12-valve 6BT. Whether you tow, daily drive, or restore, these parts focus on reliability, proper temperature control, and long service life.

Shop by Subcategory

• WATER PUMPS — complete pumps, seals, bolts, accessories.
• THERMOSTATS — 180°/190° units, housings, gaskets.
• FAN CLUTCHES & FANS — OE-style replacements and upgrades.
• RADIATORS (’91–’93) — direct-fit aluminum options for intercooled trucks.
• HEATER CORE LINES — stainless replacements for aging factory tubes.
• BLOCK HEATERS — elements, cords, and kits for cold starts.
• FREEZE PLUGS — billet & OE expansion plugs and retainers.
• BELT TENSIONERS — tensioners and related hardware.
• GAUGES & RELATED — monitor coolant temp after upgrades.

Featured for 1st Gen

• CPP HD 3-Row Aluminum Radiator (’91–’93) — high-capacity, drop-in.
• Mishimoto Aluminum Radiator (’91–’93) — performance cooling core.
• CPP Fan Clutch (’90–’98) — restores proper fan engagement.
• Heater Core Line Kit (’89–’98) — stainless/silicone upgrade.
• Cummins 5333499 Belt Tensioner (’89–’02) — OE-quality accessory drive.

Why Buy from CPP Diesel

• First-Gen Focus: Parts vetted for 1989–1993 VE-pump 12-valve applications.
• Brands You Trust: Cummins, Mishimoto, Fleece, Interstate McBee, CPP in-house, and more.
• Expert Support: Fitment help, torque specs, and maintenance guidance from diesel techs.
• Fast Shipping: Popular cooling components ship quickly from U.S. warehouses.

Explore the full 1989–1993 Cummins catalog for complementary upgrades.

Helpful Notes

• ’91.5–’93 intercooled trucks: Radiator, shroud, and hose specifics differ from early non-IC ’89–’91 setups—verify fitment before ordering.
• Thermostat choice: 180° may favor cooler running in heavy tow; 190° supports faster warm-up—match to climate and use.
• Fan drive: A weak fan clutch causes rising temps at idle/low speed; replace with a quality unit during radiator service.
• Heater lines: Stainless/silicone kits prevent corrosion leaks common with aging factory tubes.

Frequently Asked Questions

Do I need an aluminum radiator on a stock 12-valve?

Not required, but a quality aluminum core increases capacity and heat rejection—useful for towing, hot climates, or older radiators showing blockage or fin damage. See our CPP 3-Row.

Which thermostat temperature should I choose?

180° can moderate temps on long grades; 190° promotes quicker warm-up and cabin heat. Either works when paired with a healthy water pump and fan clutch. Browse THERMOSTATS.

My temps climb at idle—what should I check first?

Inspect the fan clutch, shroud fitment, and debris in the radiator fins; verify coolant level and cap condition.

Do block heaters help a first-gen Cummins?

Yes—pre-warming reduces cold-start stress and improves lubrication. See BLOCK HEATERS.

Should I replace the belt tensioner during cooling service?

If the belt squeals, tracks poorly, or the tensioner arm is sloppy, replace it. We carry the OE Cummins 5333499 tensioner.