©PREP4EXAMS@2024[REAL EXAM DUMPS] Thursday, July 25, 2024 6:51 PM
Michigan Mechanic Certification- HVAC Practice
Questions and Answers (100% Pass)
Cooling system leak diagnosis - ✔️✔️Pressure test or dye test
Purpose of a radiator - ✔️✔️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 - ✔️✔️Engine overheating and no heat from the HVAC
system
Purpose of the thermostat - ✔️✔️The purpose of the thermostat is to trap the coolant
in the engine until it reaches it operating temperature
Cause of low heater output - ✔️✔️Low coolant level, clogged heater core, leaking
heater core
Heater core hose routing - ✔️✔️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 - ✔️✔️The blower motor blows air through the heater core fins
and is warmed through the principle of conduction
Heater control valve purpose - ✔️✔️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 - ✔️✔️To test pressure test it using an adapter and a coolant
pressure tester and the value marked on the pressure cap
Reciever drier purpose - ✔️✔️May contain a filter or strainer to catch and trap foreign
particles and dirt
1
Michigan Mechanic Certification- HVAC Practice
Questions and Answers (100% Pass)
Cooling system leak diagnosis - ✔️✔️Pressure test or dye test
Purpose of a radiator - ✔️✔️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 - ✔️✔️Engine overheating and no heat from the HVAC
system
Purpose of the thermostat - ✔️✔️The purpose of the thermostat is to trap the coolant
in the engine until it reaches it operating temperature
Cause of low heater output - ✔️✔️Low coolant level, clogged heater core, leaking
heater core
Heater core hose routing - ✔️✔️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 - ✔️✔️The blower motor blows air through the heater core fins
and is warmed through the principle of conduction
Heater control valve purpose - ✔️✔️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 - ✔️✔️To test pressure test it using an adapter and a coolant
pressure tester and the value marked on the pressure cap
Reciever drier purpose - ✔️✔️May contain a filter or strainer to catch and trap foreign
particles and dirt
1
