Exam (elaborations)
Michigan Mechanic Certification- HVAC Questions and Answers
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Michigan Mechanic Certification- HVAC
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Michigan Mechanic Certification- HVACCooling system leak diagnosis - answerPressure test or dye test
Purpose of a radiator - answerThe 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 - answerEngine overheating and no heat from the HVAC
system
Purpose of the thermostat - answerThe purpose of the thermostat is to trap the coolant
in the engine until it reaches it operating temperature
Cause of low heater output - answerLow coolant level, clogged heater core, leaking
heater core
Heater core hose routing - answerThe 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 - answerThe blower motor blows air through the heater core fins
and is warmed through the principle of conduction
Heater control valve purpose - answerThis 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 - answerTo test pressure test it using an adapter and a coolant
pressure tester and the value marked on the pressure cap
Reciever drier purpose - answerMay contain a filter or strainer to catch and trap foreign
particles and dirt
Reciever drier location - answerLocated on the high side of the system between the
condenser and the evaporator
Ambient temperature switch purpose - answerMonitors temperature by increasing or
decreasing with resistance as temperature changes
Symptoms of a failing ambient temperature switch - answerA bad temperature switch
could cause an inoperative clutch or input problems
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