NOTE: This cooling system uses a cold side thermostat. The coolant in the radiator must reach full operating temperature for the thermostat to remain in an open state.
Start the engine.
Allow the engine to run for 30 minutes. Place the climate control function selector in the MAX HEAT position. Feel the lower radiator hose.
B12 CHECK THE THERMOSTAT OPERATION
Is the lower radiator hose hot?
Yes | CHECK the temperature gauge operation. REFER to: Instrumentation, Message Center and Warning Chimes . |
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No | GO to B13 |
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B13 VISUALLY INSPECT THE THERMOSTAT
Carry out the Thermostat Visual Inspection in the Component Tests .
Is the thermostat damaged?
Yes | INSTALL a new thermostat. REFER to: Thermostat . |
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No | INSTALL a new thermostat. REFER to: Thermostat . If the engine still overheats, INSTALL a new radiator. REFER to: Radiator . |
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DIAGNOSIS AND TESTING > ENGINE COOLING > PINPOINT TESTS > PINPOINT
TEST C : PINPOINT TEST
The Engine Does Not Reach Normal Operating Temperature
Normal operation and Fault Conditions
The engine cooling system maintains engine temperature during operation. Correct coolant flow through the engine, radiator and remainder of cooling system passages and components is essential to maintaining a correct engine temperature.
Engine coolant flows primarily from the engine to the radiator circuit and back to the coolant pump. Coolant is sent from the coolant pump through the engine block and cylinder head. A separate circuit from the engine also feeds the heater core with coolant. The coolant pump circulates the coolant. The coolant thermostat is a control valve actuated by coolant temperature. When the thermostat is closed, coolant flow bypasses the radiator circuit and returns to the coolant pump. When the thermostat is opened, coolant flows through the radiator circuit in order to transfer engine generated heat to the outside air.
Original technical text and illustrations, formatted as HTML. Follow the engine, transmission, equipment, model and year specified in the source. Import and layout checks do not establish applicability to every 2015–2017 Mustang. About this collection.