Pinpoint Test A : Pinpoint Test Loss Of Coolant: Notes
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.
Possible Sources
- Coolant hoses or tubes
- Hose clamps
- Thermostat O-ring seal or gasket
- Coolant pump O-ring seal or gasket
- Thermostat housing
- Radiator
- Pressure relief cap
- Coolant pump leaking from weep hole
- Heater core
- Engine gaskets (may leak internally or externally)
- Degas bottle
- Transmission fluid heater coolant control valve
- Transmission fluid cooler coolant control valve
- Transmission fluid cooler - warmer (may leak internally or externally)
- Cylinder block core plugs
- Cylinder head core plugs
- Block heater (if equipped)