68332879AB | Genuine Mopar® Auxiliary Coolant Pump 2019-26 Ram 1500

• Cooling the engine after shutdown: Some turbocharged engines keep the pump running for a few minutes after you turn the engine off. This helps prevent heat from building up around the turbocharger and other hot engine components.
• Supporting cabin heating: On some vehicles, especially at idle or in cold weather, the pump helps move hot coolant through the heater core so the cabin stays warm.
• Cooling hybrid or electric vehicle systems: In hybrids and EVs, auxiliary coolant pumps may cool the battery, electric motor, inverter, or onboard charger.
• Improving overall cooling: Some high-performance vehicles use an auxiliary pump to increase coolant flow under heavy loads or in specific operating conditions.

1. Warning lights

• Check Engine Light comes on.
• You may also see a coolant system or drivetrain warning.
• A scan tool may show codes related to coolant flow or the auxiliary pump's electrical circuit.

2. Poor cabin heat

If the pump helps circulate coolant through the heater core, you may notice:

• Weak heat at idle.
• Heat that gets warmer only when you're driving faster.
• Inconsistent cabin temperature.

3. Engine overheating

If the pump is involved in engine cooling, you might experience:

• Rising coolant temperature.
• Overheating in traffic or at low speeds.
• Temperature that returns to normal while cruising.

4. Turbocharger issues

On turbocharged vehicles, a failed after-run pump may cause:

• The pump no longer runs for a short time after you switch off the engine.
• Excessive heat around the turbocharger after driving.

5. Unusual noises

A failing pump may produce:

• Whining.
• Grinding.
• Buzzing louder than normal.
• Clicking or intermittent operation.

6. Coolant leaks

If the pump housing or seals fail, you may notice:

• Coolant dripping under the vehicle.
• Dried coolant residue (often white, pink, green, or orange depending on the coolant type).
• A sweet smell from leaking coolant.

7. Pump not running

An electric auxiliary pump should often be heard or felt operating when commanded by the vehicle. If it's completely silent when it should be running, the cause could be:

• A failed pump motor.
• A blown fuse.
• A faulty relay.
• Damaged wiring.
• A control module issue.