MACS 609 CERTIFICATION 2026 LATEST EXAM
QUESTIONS AND ANSWERS SURE A+
✔✔Mineral-based lubricants are used in which type of mobile A/C system? - ✔✔CFC-12
✔✔How much moisture is removed from a mobile A/C system during a typical
evacuation? - ✔✔Possibly none
✔✔When recovery/recycling equipment is used to remove refrigerant from a mobile A/C
system, how much lubricant will be removed during the operation? - ✔✔Generally, very
little, if any
✔✔Mobile A/C system design changes, new service procedures and equipment have
been developed for what reason? - ✔✔To reduce lifetime refrigerant emissions
✔✔Why is it necessary to ensure that service port caps containing good seals are
installed? - ✔✔To minimize refrigerant loss
✔✔Which of the following is NOT a factor in how much refrigerant can be recovered
from an A/C system? - ✔✔The age of the vehicle
, ✔✔The U.S. EPA has classified HFO-1234yf as "Acceptable, subject to use conditions."
That means: - ✔✔The refrigerant may only be used in newly manufactured vehicles with
components specifically designed for it
✔✔HFO-1234yf has been tested and found compatible with: - ✔✔PAG oil
✔✔To use an electronic leak detector, how much refrigerant must a system contain? -
✔✔About 10% to 15% of system charge
✔✔What was a key design change for HFC-134a A/C systems versus CFC-12 A/C
systems? - ✔✔Increased condenser capacity and airflow
✔✔What transports ultraviolet dye through the A/C system? - ✔✔Refrigerant oil
✔✔Which of the following statements is NOT true about newer mobile A/C systems? -
✔✔It's good practice to "Top Off" new A/C systems
✔✔When performing engine pre-heat for refrigerant removal, the technician should do
ALL of the following EXCEPT: - ✔✔Make sure the compressor is operating
✔✔What part of the Clean Air Act gives the EPA authority to establish standards
regarding servicing of mobile A/C? - ✔✔Section 609
✔✔Is it acceptable and legal to vent HFC-134a? - ✔✔No
✔✔Which of the following are concerns regarding purity of HFC-134a? - ✔✔All of the
answers are true
✔✔Why must recycled refrigerant be checked for air? - ✔✔To avoid performance loss,
system damage
✔✔HFC-134a has a Global Warming Potential (GWP) of: - ✔✔1430
✔✔Correct storage procedures for tanks of HFO-1234yf include: - ✔✔All of the answers
are true
✔✔The sale of HFC-134a in containers less than two pounds is restricted to: - ✔✔There
is no sales restriction on HFC-134a in containers less than two pounds
✔✔Which type of mobile A/C system will usually require additional time/precautions to
extract all the refrigerant? - ✔✔Accumulator type
QUESTIONS AND ANSWERS SURE A+
✔✔Mineral-based lubricants are used in which type of mobile A/C system? - ✔✔CFC-12
✔✔How much moisture is removed from a mobile A/C system during a typical
evacuation? - ✔✔Possibly none
✔✔When recovery/recycling equipment is used to remove refrigerant from a mobile A/C
system, how much lubricant will be removed during the operation? - ✔✔Generally, very
little, if any
✔✔Mobile A/C system design changes, new service procedures and equipment have
been developed for what reason? - ✔✔To reduce lifetime refrigerant emissions
✔✔Why is it necessary to ensure that service port caps containing good seals are
installed? - ✔✔To minimize refrigerant loss
✔✔Which of the following is NOT a factor in how much refrigerant can be recovered
from an A/C system? - ✔✔The age of the vehicle
, ✔✔The U.S. EPA has classified HFO-1234yf as "Acceptable, subject to use conditions."
That means: - ✔✔The refrigerant may only be used in newly manufactured vehicles with
components specifically designed for it
✔✔HFO-1234yf has been tested and found compatible with: - ✔✔PAG oil
✔✔To use an electronic leak detector, how much refrigerant must a system contain? -
✔✔About 10% to 15% of system charge
✔✔What was a key design change for HFC-134a A/C systems versus CFC-12 A/C
systems? - ✔✔Increased condenser capacity and airflow
✔✔What transports ultraviolet dye through the A/C system? - ✔✔Refrigerant oil
✔✔Which of the following statements is NOT true about newer mobile A/C systems? -
✔✔It's good practice to "Top Off" new A/C systems
✔✔When performing engine pre-heat for refrigerant removal, the technician should do
ALL of the following EXCEPT: - ✔✔Make sure the compressor is operating
✔✔What part of the Clean Air Act gives the EPA authority to establish standards
regarding servicing of mobile A/C? - ✔✔Section 609
✔✔Is it acceptable and legal to vent HFC-134a? - ✔✔No
✔✔Which of the following are concerns regarding purity of HFC-134a? - ✔✔All of the
answers are true
✔✔Why must recycled refrigerant be checked for air? - ✔✔To avoid performance loss,
system damage
✔✔HFC-134a has a Global Warming Potential (GWP) of: - ✔✔1430
✔✔Correct storage procedures for tanks of HFO-1234yf include: - ✔✔All of the answers
are true
✔✔The sale of HFC-134a in containers less than two pounds is restricted to: - ✔✔There
is no sales restriction on HFC-134a in containers less than two pounds
✔✔Which type of mobile A/C system will usually require additional time/precautions to
extract all the refrigerant? - ✔✔Accumulator type
