Pinpoint Test A : Loss Of Coolant: Notes
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
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
- Quick connect couplings
- Thermostat O-ring seal or gasket
- Coolant pump O-ring seal or gasket
- Coolant inlet connector
- Coolant outlet connector
- Radiator
- Pressure relief cap
- Coolant pump leaking from weep hole
- Cabin heater coolant pump
- Heater core
- Engine gaskets (may leak internally or externally)
- Oil cooler (may leak internally or externally)
- Degas bottle
- Transmission fluid cooler (may leak internally or externally)
- Transmission fluid heater coolant control valve
- Cylinder block core plugs
- Cylinder head core plugs
- Block heater (if equipped)
- ECT sensor - primary cooling system
- EGR cooler (may leak internally or externally)
- Turbocharger