MACS 609 CERTIFICATION EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: - ANS Approved by
some vehicle manufactures but not by others
One effect of some refrigerant gases in the atmosphere is that they: - ANS Contribute to
trapping heat
Which item is not mentioned in the SAE J2099 Standard of refrigerant purity? - ANS Sludge
When it has been determined that an A/C system has a low refrigerant charge, what should be
done? - ANS Perform a leak test procedure
Which item is not mentioned in the SAE J1991 standard of refrigerant purity? - ANS Acid
Which of the following is unlikely to affect refrigerant charge accuracy? - ANS A/C
Compressor
CFC-12 recovery equipment has SAE 3/8-inch service fittings. HFC-134a recovery equipment
has: - ANS Quick-couple design
@2026/2027 ALLRIGHTS RESERVED.
, What is the advantage of using refrigerant identification equipment? - ANS Allows the ability
to determine what type of refrigerant is in system
If an HFC-134a A/C system still has pressure after the first refrigerant recovery process is
complete (including the five-minute pause), additional recovery is necessary until the system
vacuum level remains stable for: - ANS 2 minutes
Paid technicians who service or repair buses using HCFC-22 as refrigerant, and/or service or
repair aircraft or ship/boat cargo refrigeration equipment: - ANS Must be Section 608 Type II
Certified
Specific safety information for managing incidents involving refrigerants and other chemicals
(inhalation, spills, fires, etc.) is found in the: - ANS Material safety data sheet (MSDS) for the
chemical
To what does Global Warming Potential (GWP) refer? - ANS Relative ability to produce global
warming effect
When performing engine pre-heat for refrigerant removal, the technician should do ALL of the
following EXCEPT: - ANS Make sure the compressor is operating
PAG lubricant: - ANS Is hygroscopic (absorbs moisture)
Electronic leak detectors certified to SAE J2791 have the capability of identifying leakage rates
as low as: - ANS 0.15 ounce (4 grams) per year
When using an HFC-134a refrigerant recovery machine, after completing the first recovery
process, how long must you wait, then check the machine's gauges for a rise in pressure above
vacuum, which would indicate that the system still contains some refrigerant? - ANS 5
minutes
@2026/2027 ALLRIGHTS RESERVED.
QUESTIONS AND ANSWERS 2026
VERIFIED.
The use of ultraviolet (UV) or fluorescent dyes in an HFO-1234yf system is: - ANS Approved by
some vehicle manufactures but not by others
One effect of some refrigerant gases in the atmosphere is that they: - ANS Contribute to
trapping heat
Which item is not mentioned in the SAE J2099 Standard of refrigerant purity? - ANS Sludge
When it has been determined that an A/C system has a low refrigerant charge, what should be
done? - ANS Perform a leak test procedure
Which item is not mentioned in the SAE J1991 standard of refrigerant purity? - ANS Acid
Which of the following is unlikely to affect refrigerant charge accuracy? - ANS A/C
Compressor
CFC-12 recovery equipment has SAE 3/8-inch service fittings. HFC-134a recovery equipment
has: - ANS Quick-couple design
@2026/2027 ALLRIGHTS RESERVED.
, What is the advantage of using refrigerant identification equipment? - ANS Allows the ability
to determine what type of refrigerant is in system
If an HFC-134a A/C system still has pressure after the first refrigerant recovery process is
complete (including the five-minute pause), additional recovery is necessary until the system
vacuum level remains stable for: - ANS 2 minutes
Paid technicians who service or repair buses using HCFC-22 as refrigerant, and/or service or
repair aircraft or ship/boat cargo refrigeration equipment: - ANS Must be Section 608 Type II
Certified
Specific safety information for managing incidents involving refrigerants and other chemicals
(inhalation, spills, fires, etc.) is found in the: - ANS Material safety data sheet (MSDS) for the
chemical
To what does Global Warming Potential (GWP) refer? - ANS Relative ability to produce global
warming effect
When performing engine pre-heat for refrigerant removal, the technician should do ALL of the
following EXCEPT: - ANS Make sure the compressor is operating
PAG lubricant: - ANS Is hygroscopic (absorbs moisture)
Electronic leak detectors certified to SAE J2791 have the capability of identifying leakage rates
as low as: - ANS 0.15 ounce (4 grams) per year
When using an HFC-134a refrigerant recovery machine, after completing the first recovery
process, how long must you wait, then check the machine's gauges for a rise in pressure above
vacuum, which would indicate that the system still contains some refrigerant? - ANS 5
minutes
@2026/2027 ALLRIGHTS RESERVED.
