SOS MECHANIC CERTIFICATION- HVAC EXAM | COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS | LATEST UPDATE (2026) | ALREADY GRADED A+
1. What should be used when installing o rings Refrigerant oil not the
right answer
2. which of the following is true about thermostat all the above
3. moisture contamination inside the air conditioning all the above
system can cause
4. a vehicle has low heater output which of the following restricted of leaves not the
would not cause this output right answer
5. when charging r12 to r134 the performance of which condenser
component must increase the most
6. a overcharged air conditioning system is indicated by above normal gauge read-
ings
7. the high side reading is too high what should you do evacuate and recharge be-
to correct this cause there is air in the
system
8. in an air conditioning system the unit that removes evaporator
moisture and heat from the air is the
9. the refrigerant line going from the compressor to the High pressure gas
condenser is the
10. the refrigerant line going from the expansion valve to Low pressure liquid
the evaporator is the
11. Low pressure gas
1/8
, SOS MECHANIC CERTIFICATION- HVAC EXAM | COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS | LATEST UPDATE (2026) | ALREADY GRADED A+
12. the refrigerant line going from the condenser to the High pressure liquid
receiver drier is the
13. The purpose of the receiver drier pick up tool all the above
14. Create fully recharge the system
if you are checking for a slow leak on a AC system with before you start to check it
r12
15. when the blower is on high speed water vapor droplets hose is plugged
come out of the air duct what does this indicate
16. the ambient temperature switch is used to prevent the The compressor runs hot
compressor from operating when not the right answer
17. overcharging the AC unit will cause extremely high head pres-
sure
18. when you replace a AC compressor it is a good practice all the above
to
19. which one of the following is true about the AC system fittings for r12 are not
compatible with r134a
20. which one of the following would prevent the clutch all the above
from engaging
21. condenser
2/8
ANSWERS | LATEST UPDATE (2026) | ALREADY GRADED A+
1. What should be used when installing o rings Refrigerant oil not the
right answer
2. which of the following is true about thermostat all the above
3. moisture contamination inside the air conditioning all the above
system can cause
4. a vehicle has low heater output which of the following restricted of leaves not the
would not cause this output right answer
5. when charging r12 to r134 the performance of which condenser
component must increase the most
6. a overcharged air conditioning system is indicated by above normal gauge read-
ings
7. the high side reading is too high what should you do evacuate and recharge be-
to correct this cause there is air in the
system
8. in an air conditioning system the unit that removes evaporator
moisture and heat from the air is the
9. the refrigerant line going from the compressor to the High pressure gas
condenser is the
10. the refrigerant line going from the expansion valve to Low pressure liquid
the evaporator is the
11. Low pressure gas
1/8
, SOS MECHANIC CERTIFICATION- HVAC EXAM | COMPLETE QUESTIONS AND CORRECT DETAILED
ANSWERS | LATEST UPDATE (2026) | ALREADY GRADED A+
12. the refrigerant line going from the condenser to the High pressure liquid
receiver drier is the
13. The purpose of the receiver drier pick up tool all the above
14. Create fully recharge the system
if you are checking for a slow leak on a AC system with before you start to check it
r12
15. when the blower is on high speed water vapor droplets hose is plugged
come out of the air duct what does this indicate
16. the ambient temperature switch is used to prevent the The compressor runs hot
compressor from operating when not the right answer
17. overcharging the AC unit will cause extremely high head pres-
sure
18. when you replace a AC compressor it is a good practice all the above
to
19. which one of the following is true about the AC system fittings for r12 are not
compatible with r134a
20. which one of the following would prevent the clutch all the above
from engaging
21. condenser
2/8
