Pinpoint Test A : Pinpoint Test: Notes

Loss of Coolant 

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 housing
• Thermostat housing O-ring seals
• Coolant pump gasket
• Radiator
• Pressure relief cap
• Coolant pump
• Oil cooler (may leak internally or externally) (if equipped)
• Heater core
• Engine gaskets (may leak internally or externally)
• Degas bottle
• Cylinder block core plugs
• Cylinder head core plugs
• Block heater (if equipped)