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  • DODGE CUMMINS
  • FORD POWERSTROKE
  • GM DURAMAX
  • COMMERCIAL / INDUSTRIAL
  • CUMMINS CONVERSION PARTS
  • CPP GEAR
  • USED PARTS
  • SHOP BY BRAND

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    • COOLING SYSTEM

    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.

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    Featured for 1st Gen

    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.

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