Michigan Mechanic Certification- HVAC Rated A+
Cooling System Diagnosis
How do you diagnose a cooling system leak? Perform a pressure test or dye test.
What is the primary function of a radiator? To dissipate heat from the coolant into the air.
What symptoms indicate low coolant levels? Eng...
How do you diagnose a cooling system leak? Perform a pressure test or dye test.
What is the primary function of a radiator? To dissipate heat from the coolant into the air.
What symptoms indicate low coolant levels? Engine overheating and no heat from the HVAC system.
What is the purpose of a thermostat? To trap coolant in the engine until it reaches operating
temperature.
What could cause low heater output? Low coolant level, clogged heater core, or leaking heater core.
How should heater core hoses be routed? The supply hose should run from the closed side of the
thermostat to the heater core, and the return hose should run from the heater core to the engine.
How does a heater core operate? The blower motor blows air through the fins and is warmed by
conduction.
What is the purpose of the heater control valve? To control the flow of coolant to the heater core to
regulate temperature.
How do you test a radiator cap? Use an adapter and coolant pressure tester to check pressure against
the value marked on the cap.
What is the purpose of a receiver drier? To contain a filter or strainer to catch foreign particles and dirt.
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