COOLING SYSTEM — 2019–2024 DODGE RAM 6.7L CUMMINS

Maintain rock-solid temperatures on your 5th Gen Ram 2500/3500 6.7L Cummins. This collection brings together OEM Mopar replacements and premium upgrades—water pumps, 190° thermostats, tanks, radiators, silicone hoses, fan clutches, coolant bypass kits, and service accessories—curated for towing reliability and daily performance.

Shop the full category: Cooling System (19–24)

Core Components

• Mopar 68569196AA Water Pump — OE fit and flow for 2019–2024.
• Mopar 68534176AA 190° Thermostat — factory-temp control for modern 6.7L trucks.
• Mopar 68370066AC Coolant Recovery Tank — restores proper expansion and level monitoring.
• CSF 3944 Radiator (2019–2022, non-HO) — OE-style replacement for SO trucks.

Hoses, Pipes & Hardware

• PPE 219031900 Upper & Lower Silicone Hose Kit (19–25) — durable, heat-resistant upgrade.
• WCFab WCF100251 Upper Coolant Pipe — HO  |  WCF100223 — SO
• OEM Radiator Hoses: Upper 68359598AF (2500/3500), Upper 68359600AF (3500/4500/5500), Lower 68359638AC (2500/3500), Lower 68359639AC (3500/4500/5500)
• Mopar 68359842AD Fan Clutch — correct engagement under load.

Thermostat Housing, Bypass & Sensors

• Fleece FPE-CUMM-TH-19 Thermostat Housing w/ Aux Port — add a sender or degas return cleanly.
• Fleece FPE-CLNTBYPS-CUMMINS-19 Coolant Bypass Kit — balances rear-cylinder temps on hard-working builds.
• Coolant Level Sensor 68489744AA  |  Coolant Temp Sensor 5011852AB

Service & Cold-Weather Support

• Mopar 68409910AB Block Heater Cord — faster winter starts.
• Mishimoto Liquid Chill Additive — helps reduce temps & corrosion.
• Mishimoto Adjustable Fan Controller — dial in electric fan setups.

Related 19–24 Categories

• Intercoolers
• Turbochargers

Frequently Asked Questions

How do I tell if I have HO or SO cooling hardware?

HO (Aisin) trucks use different radiator/piping than SO (68RFE). If unsure, check your transmission type and compare part listings—see our WCFab HO/SO upper pipe options and CSF 3944 radiator notes.

Why add a coolant bypass on a 2019–2024?

On heavy tow or tuned trucks, rear cylinder temps can run hotter. The bypass kit improves flow balance and can reduce localized hotspots.

Do I need tuning for cooling upgrades?

No. Thermostats, tanks, hoses, radiators, and fan clutches are mechanical/OE-style parts and do not require tuning.

What are common signs of a failing water pump or fan clutch?

Coolant weep marks, bearing noise, or overheating at idle/load. Replace with OE parts and verify belt tension and shroud fitment.

Any cold-weather tips?

Use the block heater cord in sub-freezing temps and keep the degas bottle at the correct level to avoid low-coolant messages.

Need help choosing parts? Call 724-785-4022 or message CPP Diesel—our team will match components to your VIN and use case.