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Michigan Mechanic Certification- HVAC Questions and Answers $17.49   Add to cart

Exam (elaborations)

Michigan Mechanic Certification- HVAC Questions and Answers

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  • Course
  • Michigan Mechanic
  • Institution
  • Michigan Mechanic

Michigan Mechanic Certification- HVAC

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  • August 24, 2024
  • 3
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Michigan Mechanic
  • Michigan Mechanic
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julianah420
Michigan Mechanic Certification- HVAC


Cooling 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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