TRA INING
The Environmentally Safe Way to Service your Fluids
Avoid Air Pockets in your Cooling System!
60% of downtime & 30% of total engine repair costs are
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ESOC has developed a unique system that Extracts, Stores
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Easing coolant system maintenance and repair.
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Increase shop productivity
VehicleServicePros.com/10122067
March 2018 | VehicleServicePros.com 33
it should be used as a known
good part. I have diagnosed
behind many technicians
to fi nd a trail of unintended
damage to fasteners,
circuitry, connector terminals
and many high-dollar
components.
Determining
different relays
Th ere are notable concerns
with this dangerous method
of swapping relays to troubleshoot
circuitry. It is important
to know how to accurately
test for a damaged or incorrect
relay in a system. Th e two
common types of suppressed
relays (relays that have little
or no voltage spike) are resistor
and diode. Both types
can fail and should not be
interchanged.
To clarify, swapping relays
is not the only item that can
cause voltage spikes, but it is a
shortcut practice that can lead
to avoidable damage. Some
circuitry/components have
suppression devices inside
them and others are more
sensitive to voltage spikes,
but if a low-voltage circuit
is continually exposed to
high-voltage spikes, damage
will most likely occur.
Technicians that are welltrained
understand it is
much easier to take the time
to make a few measurements
to reveal the root cause
instead of being misled by
swapping parts that may
lead you down the wrong
diagnostic path. When parts
are replaced and they fail
repeatedly because the root
cause was never found, it can
increase and extend vehicle
downtime.
Make sure if you are replacing
with a known good part
that it is the correct one. If
you suspect voltage spike
damage, check for incorrect
components or damaged
suppression circuits.
» The two figures here show the
internal differences of each relay.
Fig. 1 has snuffing/clamping diodes
for the dissipation of the voltage
spike. Fig. 2 does not have diodes, so
when the coil turns off (collapses),
a voltage spike will occur.
Image courtesy of K&D Technical Innovations
SERIES CEX-14
14 Gallon Capacity
SERIES CEX-32
32 Gallon Capacity
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