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MICHIGAN MECHANIC CERTIFICATION- HVAC STUDY GUIDE #7.
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MICHIGAN MECHANIC CERTIFICATION- HVAC STUDY GUIDE #7.
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MICHIGAN MECHANIC CERTIFICATION- HVAC STUDY GUIDE #7Cooling system leak diagnosis - correct answer Pressure test or dye test
Purpose of a radiator - correct answer 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 answer Engine overheating and no heat from the HVAC system
Purpose of the thermostat - correct answer 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 answer Low coolant level, clogged heater core, leaking heater core
Heater core hose routing - correct answer 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 answer The blower motor blows air through the heater core fins and is warmed through the principle of conduction
Heater control valve purpose - correct answer 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 answer To test pressure test it using an adapter and a coolant pressure tester and the value marked on the pressure cap
Reciever drier purpose - correct answer May contain a filter or strainer to catch and trap
foreign particles and dirt
Reciever drier location - correct answer Located on the high side of the system between
the condenser and the evaporator
Ambient temperature switch purpose - correct answer Monitors temperature by increasing or decreasing with resistance as temperature changes
Symptoms of a failing ambient temperature switch - correct answer A bad temperature switch could cause an inoperative clutch or input problems
Orifice expansion tube operation - correct answer Has a valve that can vary the size of the opening to allow more or less liquid refrigerant through to the evaporator
Orifice expansion tube purpose - correct answer High pressure liquid enters, low pressure liquid leaves
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