Normal Operation
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The engine cooling system is a closed system providing for coolant expansion and contraction and also 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.
For engine specific information, refer to ENGINE COOLING in the Description and Operation portion of this service information.
This pinpoint test is intended to diagnose the following:
- Coolant hoses or tubes
- Hose clamps
- Thermostat housing gasket
- Coolant pump O-ring seal
- Thermostat housing
- Radiator
- Pressure relief cap
- Coolant pump leaking from weep hole
- Heater core
- Engine gaskets
- Degas bottle
- Cylinder block core plugs
- Cylinder head core plugs
- Block heater (if equipped)