Test A: Loss of Engine Coolant

Pinpoint Test A: Loss Of Engine Coolant

Normal Operation

The engine cooling system is a closed system that provides for coolant expansion and contraction and also changes in pressure as coolant warms and cools with engine operation. Various gaskets, seals, hoses and clamps are used to contain coolant within the cooling system and keep other fluids and contaminants from entering the cooling system.

Coolant loss can be attributed to either eAernal or internal leaks anywhere within the cooling system.

For vehicle/engine specific information, refer to Engine Cooling in the Description and Operation portion of this section.

This pinpoint test is intended to diagnose the following:

^ Coolant hoses or tubes
^ Hose clamps
^ Thermostat 0-ring seal or gasket
^ Coolant pump 0-ring seal or gasket
^ Thermostat housing
^ Radiator
^ Pressure relief cap
^ Coolant pump leaking from weep hole
^ Heatercore
^ Engine gaskets
^ Oil cooler (if equipped)
^ Degas bottle
^ Cylinder block core plugs
^ Cylinder head core plugs Block heater (if equipped)