MACS Monthly Newsletter - 2020 - OCT8

As we have described earlier, if the TXV contains an
inlet screen, it can be cleaned or replaced.
In summary, we have included a TXV Troubleshooting Chart to assist in diagnosing common repair issues associated with expansion valves (Figure 13).
We hope these two issues of MACS Service Reports have helped you understand the basic functions of the TXV and the common types seen in today's mobile A/C systems. Diagnosing the system
can be tricky so hopefully these troubleshooting
tips will help you determine if the TXV is functioning properly. n

Dianetti/Milliman

Dual evaporator systems create a unique challenge when diagnosing system issues. It is common
to have a TXV contolling the auxilliary evaporator, along with either a TXV or an orifice tube controlling the main evaporator in the front system.
In orifice tube / TXV dual automotive evaporator
systems, filters are not typically used for protecting the rear TXV. Debris from a failed compressor
will often reach the rear TXV even if the system is
flushed. Often times, the rear A/C will stop working after a few days.
Figures 11 and 12 illustrate the screen and how
the TXV can be plugged with debris in these cases.

Figure 13: TXV Troubleshooting Chart to assist in diagnosing common repair issues.

MACS Service Reports is published monthly by the Mobile Air Conditioning Society
Worldwide. It is distributed to members of MACS Worldwide and is intended for
the educational use of members of the automotive air conditioning service and
repair industry. Suggestions for articles will be considered for publication, however,
MACS Worldwide reserves the right to choose and edit all submissions.

Editors:	
Elvis Hoffpauir, Steve Schaeber
Production Designer: 	
Laina Forcey
Manager of Service Training:	
Steve Schaeber
Mobile Air Conditioning Society Worldwide
P.O. Box 88, Lansdale, PA 19446
Phone: (215) 631-7020 * Fax: (215) 631-7017
Email: membership@macsw.org * Website: www.macsw.org

Unless otherwise noted, all photos/art by author.

October 2020	

8	

MACS Service Reports



http://www.macsw.org

MACS Monthly Newsletter - 2020

Table of Contents for the Digital Edition of MACS Monthly Newsletter - 2020

MACS Monthly Newsletter - 2020 - JAN1
MACS Monthly Newsletter - 2020 - JAN2
MACS Monthly Newsletter - 2020 - JAN3
MACS Monthly Newsletter - 2020 - JAN4
MACS Monthly Newsletter - 2020 - JAN5
MACS Monthly Newsletter - 2020 - JAN6
MACS Monthly Newsletter - 2020 - JAN7
MACS Monthly Newsletter - 2020 - JAN8
MACS Monthly Newsletter - 2020 - FEB1
MACS Monthly Newsletter - 2020 - FEB2
MACS Monthly Newsletter - 2020 - FEB3
MACS Monthly Newsletter - 2020 - FEB4
MACS Monthly Newsletter - 2020 - FEB5
MACS Monthly Newsletter - 2020 - FEB6
MACS Monthly Newsletter - 2020 - FEB7
MACS Monthly Newsletter - 2020 - FEB8
MACS Monthly Newsletter - 2020 - MAR1
MACS Monthly Newsletter - 2020 - MAR2
MACS Monthly Newsletter - 2020 - MAR3
MACS Monthly Newsletter - 2020 - MAR4
MACS Monthly Newsletter - 2020 - MAR5
MACS Monthly Newsletter - 2020 - MAR6
MACS Monthly Newsletter - 2020 - MAR7
MACS Monthly Newsletter - 2020 - MAR8
MACS Monthly Newsletter - 2020 - APR1
MACS Monthly Newsletter - 2020 - APR2
MACS Monthly Newsletter - 2020 - APR3
MACS Monthly Newsletter - 2020 - APR4
MACS Monthly Newsletter - 2020 - APR5
MACS Monthly Newsletter - 2020 - APR6
MACS Monthly Newsletter - 2020 - APR7
MACS Monthly Newsletter - 2020 - APR8
MACS Monthly Newsletter - 2020 - MAY1
MACS Monthly Newsletter - 2020 - MAY2
MACS Monthly Newsletter - 2020 - MAY3
MACS Monthly Newsletter - 2020 - MAY4
MACS Monthly Newsletter - 2020 - MAY5
MACS Monthly Newsletter - 2020 - MAY6
MACS Monthly Newsletter - 2020 - MAY7
MACS Monthly Newsletter - 2020 - MAY8
MACS Monthly Newsletter - 2020 - JUN1
MACS Monthly Newsletter - 2020 - JUN2
MACS Monthly Newsletter - 2020 - JUN3
MACS Monthly Newsletter - 2020 - JUN4
MACS Monthly Newsletter - 2020 - JUN5
MACS Monthly Newsletter - 2020 - JUN6
MACS Monthly Newsletter - 2020 - JUN7
MACS Monthly Newsletter - 2020 - JUN8
MACS Monthly Newsletter - 2020 - AUG1
MACS Monthly Newsletter - 2020 - AUG2
MACS Monthly Newsletter - 2020 - AUG3
MACS Monthly Newsletter - 2020 - AUG4
MACS Monthly Newsletter - 2020 - AUG5
MACS Monthly Newsletter - 2020 - AUG6
MACS Monthly Newsletter - 2020 - AUG7
MACS Monthly Newsletter - 2020 - AUG8
MACS Monthly Newsletter - 2020 - SEP1
MACS Monthly Newsletter - 2020 - SEP2
MACS Monthly Newsletter - 2020 - SEP3
MACS Monthly Newsletter - 2020 - SEP4
MACS Monthly Newsletter - 2020 - SEP5
MACS Monthly Newsletter - 2020 - SEP6
MACS Monthly Newsletter - 2020 - SEP7
MACS Monthly Newsletter - 2020 - SEP8
MACS Monthly Newsletter - 2020 - OCT1
MACS Monthly Newsletter - 2020 - OCT2
MACS Monthly Newsletter - 2020 - OCT3
MACS Monthly Newsletter - 2020 - OCT4
MACS Monthly Newsletter - 2020 - OCT5
MACS Monthly Newsletter - 2020 - OCT6
MACS Monthly Newsletter - 2020 - OCT7
MACS Monthly Newsletter - 2020 - OCT8
MACS Monthly Newsletter - 2020 - DEC1
MACS Monthly Newsletter - 2020 - DEC2
MACS Monthly Newsletter - 2020 - DEC3
MACS Monthly Newsletter - 2020 - DEC4
MACS Monthly Newsletter - 2020 - DEC5
MACS Monthly Newsletter - 2020 - DEC6
MACS Monthly Newsletter - 2020 - DEC8
MACS Monthly Newsletter - 2020 - DEC9
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