Michigan Mechanic Certification- HVAC
Exam 2025 With 100% Correct Answers
Cooling system leak diagnosis - correct answers ✔✔Pressure test or dye test
Purpose of a radiator - correct answers ✔✔The purpose of the radiator is to dissipate heat that is picked
up by coolant in the engine into the air passing through its fins and tubes
Symptoms of low coolant - correct answers ✔✔Engine overheating and no heat from the HVAC system
Purpose of the thermostat - correct answers ✔✔The purpose of the thermostat is to trap the coolant in
the engine until it reaches it operating temperature
Cause of low heater output - correct answers ✔✔Low coolant level, clogged heater core, leaking heater
core
Heater core hose routing - correct answers ✔✔The supply hose from the heater core 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
Heater core operation - correct answers ✔✔The blower motor blows air through the heater core fins
and is warmed through the principle of conduction
Heater control valve purpose - correct answers ✔✔This valve controls the flow of the coolant to the
heater core to control the temperature of the air desired by the operator
Radiator cap testing - correct answers ✔✔To test pressure test it using an adapter and a coolant
pressure tester and the value marked on the pressure cap
Exam 2025 With 100% Correct Answers
Cooling system leak diagnosis - correct answers ✔✔Pressure test or dye test
Purpose of a radiator - correct answers ✔✔The purpose of the radiator is to dissipate heat that is picked
up by coolant in the engine into the air passing through its fins and tubes
Symptoms of low coolant - correct answers ✔✔Engine overheating and no heat from the HVAC system
Purpose of the thermostat - correct answers ✔✔The purpose of the thermostat is to trap the coolant in
the engine until it reaches it operating temperature
Cause of low heater output - correct answers ✔✔Low coolant level, clogged heater core, leaking heater
core
Heater core hose routing - correct answers ✔✔The supply hose from the heater core 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
Heater core operation - correct answers ✔✔The blower motor blows air through the heater core fins
and is warmed through the principle of conduction
Heater control valve purpose - correct answers ✔✔This valve controls the flow of the coolant to the
heater core to control the temperature of the air desired by the operator
Radiator cap testing - correct answers ✔✔To test pressure test it using an adapter and a coolant
pressure tester and the value marked on the pressure cap
