PTEN_0321 - 29

These would appear as a " U " code and
should be addressed and corrected prior
to any other repairs.
Once electronic system repairs have
been performed, and you've determined
if your machine and refrigerant supply
will be safe from contamination, you can
connect your RRR machine. Normal
system operating pressures can also be
found in the vehicle information database. Use your machine to service the
system as needed.
If the system is still not functioning
normally most vehicle information databases have a trouble shooting guide specific to the vehicle, but you should note
that almost all vehicle manufacturers
have a recommended Performance Test.
This test when followed will both prepare the vehicle in the manner the vehicle

manufacturer requires for testing and
will provide the technician with information that will be consistent from one
test to another during their diagnosis.
For example, if you were to test a vehicle
on an afternoon that was 95 degrees, the
system pressures would not be the same
if you tested the same vehicle the next
morning when it was 55 degrees outside.
One of the best, quickest, and most
accurate test tools I have seen for troublesome HVAC issues are the various
analyzers that use a series of wireless
pressure transducers and temperature
sensors to evaluate and determine the
most likely cause of system issues based
on various algorithms. These tools calculate superheat and subcool to determine if the system is correctly charged,
whether air is present in the charge, and

a variety of other problems. These tools
can save a technician numerous hours of
time spent trying to diagnose either difficult or intermittent issues. As an added
bonus, these tools are relatively inexpensive and their ROI is realized after just a
few uses.
To sum things up:
* Get certified
* Take some classes on current A/C
systems
* Use correct vehicle data
* Make sure the system is not contaminated
* Prepare the vehicle for testing
Once all of these steps are done
correctly, you will be in a better position to diagnose and repair HVAC
systems more efficiently, and become
more profitable.

RELATED TOOLS
CPS Products
BLACKMAX DUAL R134A/
R1234YF GAUGE MANIFOLD
SET, NO. MAID8QDL

Techno Tools
REFRIGERANT GAS LEAK
DETECTOR, NO. D440A
Circle 76 on card, or enter
at " e-inquiry " on
VehicleServicePros.com

Circle 75 on card, or enter
at " e-inquiry " on
VehicleServicePros.com

Neutronics
LEGEND SERIES
REFRIGERANT ANALYZER
Circle 77 on card, or enter
at " e-inquiry " on
VehicleServicePros.com

Matco Tools
R-1234YF TOUCHSCREEN
AUTOMATIC RRR, NO. AC443
Circle 78 on card, or enter
at " e-inquiry " on
VehicleServicePros.com

www.VehicleServicePros.com

MARCH 2021

PROFESSIONAL TOOL & EQUIPMENT NEWS

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PTEN_0321

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