MACS Service Reports - 2015 - JAN8
or longer, it should keep the system air-free as coolant is drawn in (Figures 16, 17). Is the vacuum lift a
"perfect" answer? Nothing is perfect, and if the system flow configuration is complex, well, you never
know. If that's a possibility, a thermocycle or two
should finish off the job.
may be poor heating on only one side. That symptom
leads many technicians to look for a ducting problem,
or in the case of a split system, to a problem with the
mode control and/or temperature control (actuator
and/or the flap door) on the misbehaving side.
Okay, but before you tear apart a dashboard, keep
the partial plugging in mind. Unfortunately, if there
are tubes that are reasonably clear, a simple flow test
may be deceptive, because you'll see what is apparently good flow from inlet to outlet. But unless there's
a trouble code for a split system temperature sensor
or actuator, a pulsating back flush is the higher-percentage service and generally a lot less labor-intensive
(with a higher rate of success) than tearing apart the
dashboard. ■
PARTIAL PLUGGING
There's a perception that debris plugs all the tubes
of a heater core gradually, but that's just not the way it
often happens. Sometimes larger particles fill one section first. While the flow through the rest of the core
continues reasonably well. So the first symptoms (depending on how the core is mounted relative to the
floor ductwork on the driver versus passenger side),
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 Casey
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.
January 2015
8
MACS Service Reports
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Table of Contents for the Digital Edition of MACS Service Reports - 2015
MACS Service Reports - 2015 - JAN1
MACS Service Reports - 2015 - JAN2
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MACS Service Reports - 2015 - JAN8
MACS Service Reports - 2015 - FEB1
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MACS Service Reports - 2015 - MAR1
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MACS Service Reports - 2015 - MAR8
MACS Service Reports - 2015 - APR1
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MACS Service Reports - 2015 - MAY1
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MACS Service Reports - 2015 - MAY7
MACS Service Reports - 2015 - MAY8
MACS Service Reports - 2015 - JUN1
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MACS Service Reports - 2015 - JUN5
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MACS Service Reports - 2015 - JUN7
MACS Service Reports - 2015 - JUN8
MACS Service Reports - 2015 - JUL1
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MACS Service Reports - 2015 - JUL8
MACS Service Reports - 2015 - AUG1
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MACS Service Reports - 2015 - AUG6
MACS Service Reports - 2015 - AUG7
MACS Service Reports - 2015 - AUG8
MACS Service Reports - 2015 - SEP1
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MACS Service Reports - 2015 - OCT1
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MACS Service Reports - 2015 - OCT7
MACS Service Reports - 2015 - OCT8
MACS Service Reports - 2015 - NOV1
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MACS Service Reports - 2015 - NOV8
MACS Service Reports - 2015 - DEC1
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MACS Service Reports - 2015 - DEC5
MACS Service Reports - 2015 - DEC6
MACS Service Reports - 2015 - DEC7
MACS Service Reports - 2015 - DEC8
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