Mazda CT-L1005, Training Manual

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Basic Climate Control Diagnosis and Repair
Diagnosis and Repair
Pressure Gauges
•
Mazda special tool 49 C061 001A consists of a low- and high-pressure gauge for the
A/C system that allows the refrigerant pressures to be monitored during operation. After
attaching the pressure gauges the first thing that should be seen is that the pressures on
the high- and low-pressure side are equal. Once the A/C is activated, the pressure on
the high-pressure side will increase, and the pressure on the low-pressure side will settle
to its operating condition. Until this occurs, there can be no cooling effect expected, as
the required pressure differential across either the expansion valve or the fixed orifice
will not be present.
•
In the event the A/C does not function, the pressure gauges can be used to assist in
diagnosing the problem.
NOTE : Most A/C service machines have pressure gauges incorporated. If this is the case,
there is no need to attach additional pressure gauges.
Curriculum Training 05-1