PINPOINT TEST A : Loss of Coolant: Notes
WARNING: This page is about a different variant/trim than selected.
Normal operation and Fault Conditions
The engine cooling system is a closed system providing for coolant expansion and contraction as well as changes in pressure as coolant warms and cools with engine operation. Various gaskets, seals, hoses and clamps contain coolant within the cooling system and keep other fluids and contaminants from entering the cooling system. Coolant loss can be attributed to either external or internal leaks anywhere within the cooling system.
Possible Sources
- Coolant hoses or tubes
- Hose clamps
- Thermostat housing
- Thermostat housing O-ring seals
- Coolant pump gasket
- Radiator
- Charge air cooler radiator
- Charge air cooler
- Charge air cooler coolant pump
- Pressure relief cap
- Coolant pump
- Turbocharger (may leak internally or externally)
- Oil cooler (may leak internally or externally) (if equipped)
- Heater core
- Engine gaskets (may leak internally or externally)
- Transmission fluid cooler (may leak internally or externally)
- Degas bottle
- Transmission fluid heater coolant control valve
- Transmission fluid warmer (may leak internally or externally)
- Cylinder block core plugs
- Cylinder head core plugs
- Block heater (if equipped)