MACS 609 CERTIFICATION EXAM PRACTICE
QUESTIONS AND CORRECT VERIFIED
SOLUTIONS 2026/2027 LATEST UPDATED
Why is it necessary to insure that service port caps containing
good seals are installed? - ANSWER-To minimize
refrigerant loss
Which of the following statements is correct about flushing
A/C systems? - ANSWER-Flushing solvents may remain in
A/C systems, causing problems
When using an HFC-134a refrigerant recovery machine,
after competing 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? - ANSWER-5
minutes
Page | 1
, Which type of tank must be used during the transfer of
refrigerant? - ANSWER-Question 10 options: Tanks
marked DOT 4BA
When it has been determined that an A/C system has a low
refrigerant charge, what should be done? - ANSWER-
Perform a leak detection procedure
One effect of some refrigerant gases in the atmosphere is that
they: - ANSWER-Contribute to trapping heat
What is not identified in the manual as a concern with field-
coupled hoses? - ANSWER-Length of hose
If lubricant is removed by recovery equipment during system
refrigerant removal, what must be done with the lubricant? -
ANSWER-Re-install lubricant removed by the recovery
equipment
Before reuse, what must be done with HFC-134a that has
been recovered from a mobile A/C system using recovery-
only equipment? - ANSWER-Question 2 options:
Page | 2
QUESTIONS AND CORRECT VERIFIED
SOLUTIONS 2026/2027 LATEST UPDATED
Why is it necessary to insure that service port caps containing
good seals are installed? - ANSWER-To minimize
refrigerant loss
Which of the following statements is correct about flushing
A/C systems? - ANSWER-Flushing solvents may remain in
A/C systems, causing problems
When using an HFC-134a refrigerant recovery machine,
after competing 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? - ANSWER-5
minutes
Page | 1
, Which type of tank must be used during the transfer of
refrigerant? - ANSWER-Question 10 options: Tanks
marked DOT 4BA
When it has been determined that an A/C system has a low
refrigerant charge, what should be done? - ANSWER-
Perform a leak detection procedure
One effect of some refrigerant gases in the atmosphere is that
they: - ANSWER-Contribute to trapping heat
What is not identified in the manual as a concern with field-
coupled hoses? - ANSWER-Length of hose
If lubricant is removed by recovery equipment during system
refrigerant removal, what must be done with the lubricant? -
ANSWER-Re-install lubricant removed by the recovery
equipment
Before reuse, what must be done with HFC-134a that has
been recovered from a mobile A/C system using recovery-
only equipment? - ANSWER-Question 2 options:
Page | 2
