Some 2023-2026 Colorado and Canyon models may have a visible coolant leak from the upper radiator inlet hose connection or a low coolant level at the overflow reservoir. DTC P3075 (Engine Coolant Flow Too Low) may be set in the Engine Control Module (ECM).
The leak condition at the upper radiator hose quick-connect fitting may be due to a degraded inlet hose seal. The leak originates from the radiator inlet hose seal itself and is not the result of a radiator failure. (Fig. 12; #1. Inlet hose retainer at the radiator; #2 Radiator inlet hose) The radiator should not be replaced for this condition.
Fig. 12
Seal wear may be seen with varying levels of residue or buildup depending on vehicle usage and operating environment. A failed lip seal, typically with material flattening and residue accumulation around the connection, indicates seal degradation rather than a radiator defect. (Fig. 13)
Fig. 13
If the leak condition is found, drain the cooling system and replace the radiator inlet hose. Be sure all debris is cleared before removing the hose to avoid introducing any contaminants into the system.
Prior to installing the new radiator inlet hose, it’s recommended to use a clean lint-free cloth to wipe the radiator spigot to remove any residual contamination that may be present from the coolant hose. The surface should be smooth and free of any contamination prior to installing the new hose.
For more information, refer to #PIT6494.
– Thanks to Nick Flannery
