SOS MECHANIC CERTIFICATION- HVAC EXAM QUESTIONS
AND CORRECT VERIFIED ANSWERS UPDATED 2024/2025
BEST RATED A+
when charging r12 to r134 the performance of which component must increase the
most -
a overcharged air conditioning system CORRECT ANSWERS condenser
is indicated by - CORRECT ANSWERS above normal gauge readings
the high side reading is too high what should you do to correct this - CORRECT
ANSWERS remove blockagage and clear any debris
in an air conditioning system the unit that removes moisture and heat from the air is the
- CORRECT ANSWERS evaporator
the refrigerant line going from the compressor to the condenser is the - CORRECT
ANSWERS High pressure gas
the refrigerant line going from the expansion valve to the evaporator is the - CORRECT
ANSWERS Low pressure liquid
the refrigerant line going from the evaporator to the expansion vale and it goes to the
compressor is the - CORRECT ANSWERS Low pressure gas
the refrigerant line going from the condenser to the receiver drier is the - CORRECT
ANSWERS High pressure liquid
The purpose of the receiver drier pick up tool - CORRECT ANSWERS all the above
What should be used when installing o rings - CORRECT ANSWERS not petroleum jelly
not silicone
use grease!!
which of the following is true about thermostat - CORRECT ANSWERS all the above
, SOS MECHANIC CERTIFICATION- HVAC EXAM QUESTIONS
AND CORRECT VERIFIED ANSWERS UPDATED 2024/2025
BEST RATED A+
moisture contamination inside the air conditioning system can cause - CORRECT
ANSWERS all the above
a vehicle has low heater output which of the following would not cause this output -
CORRECT ANSWERS restricted of leaves not the right answer
when the blower is on high speed water vapor droplets come out of the air duct what
does this indicate - CORRECT ANSWERS hose is plugged
Create
if you are checking for a slow leak on a AC system with r12 - CORRECT ANSWERS fully
recharge the system before you start to check it
the ambient temperature switch is used to prevent the compressor from operating when
- CORRECT ANSWERS not when the ambient temperature gets too low
overcharging the AC unit will cause - CORRECT ANSWERS extremely high head
pressure
when you replace a AC compressor it is a good practice to - CORRECT ANSWERS all the
above
which one of the following is true about the AC system - CORRECT ANSWERS fittings
for r12 are not compatible with r134a
which one of the following would prevent the clutch from engaging - CORRECT
ANSWERS all the above
you have hooked up the gauges started the car and set the controls for Max AC the high
and low readings are the same which of the following could cause this - CORRECT
ANSWERS condenser
an air conditioning system has been recharge several times should be - CORRECT
ANSWERS all the above
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