Coolant staining around the coolant pump area may cause an incorrect diagnosis and unnecessary replacement of coolant pump. Upon inspection, a small coolant spot or coolant staining is acceptable around the coolant pump.
If you suspect a coolant leak is present, the following replacement criteria needs to be met before you replace the pump:
• The vehicle arrives with a visible coolant leak.
• The vehicle arrives with coolant light ON.
• The vehicle arrives with the temperature warning at its highest level.
• Pressure drops in the coolant pump during a pressure test.
Courtesy of Mitchell 1.