Failure mode - Ram 6.4L HEMI Gasoline (Ram HD 2019+)

Cooling service (water pump / thermostat)

Reliability tier: aggregated - verify before ordering, see /disclosure/

Symptoms

weep-hole seepage / bearing noise at higher mileage
temperature swings under tow

Compare with the other causes of the same sign on this engine: losing coolant · overheating or temperature creeping up · ticking, knocking, rattle or whine (3 causes)

Root cause

Conventional belt-driven water pump + thermostat on a tow-biased truck: wear items, no documented systemic defect in the open record.

Diagnosis

pressure-test the system; inspect the weep hole and bearing play
check thermostat opening under load before replacing the radiator

Fixes

service: water pump / thermostat hardware as wear ()

cooling - more than one option: 6.4L HEMI Fan Clutch (OEM), 6.4L HEMI Thermostat Housing (OEM)

Prevalence

common

Affected configurations (40)