MACS Service Reports - 2015 - JAN7

techauthority.com

which would remove dirty coolant from that heat
exchanger.
Once the system is as empty as possible, connect
the vacuum lift kit, pushing the tapered neck into
the coolant fill. Virtually all manufacturers approve
this device today, even Nissan, which has tried just
about everything in the way of system filling techniques. The venturi vacuum device may not pull as
deep a vacuum as the vacuum pump in a premium flush and fill machine, but assuming you have
a good air compressor producing normal shop air
(over 90 psi), it will be enough to develop 24 inches
of vacuum or more. If it holds for about 20 seconds

Paul Weissler

Figure 14: Some engines still use block drain plugs, so check for one and
remove it to improve the percentage of coolant drained. Shown as (1) is the
3.7L-V6 drain plug on a Jeep Liberty; it is just below the exhaust manifold (2).

Paul Weissler

Figure 16: Connect fill hose in container of 50-50 mixture of coolant as
shown, then lift and place coolant jug on top of radiator, open ball valve and
coolant will be drawn by vacuum into radiator. If coolant jug is running low
on coolant, close ball valve and refill jug as necessary.

hondatechinfo.com

Figure 15: Use of air lift tool is an effective way to remove air from cooling system. Attach air hose as shown to venturi vacuum pump and look for
gauge reading to build up to at least 24 in. of vacuum or higher. Then close
ball valve (shown closed) and disconnect venturi pump from the radiator
neck adapter. Vacuum reading should hold for at least 20 seconds or there's
a leak that has to be fixed.

It works well with an empty system that has no
vacuum leaks, and vacuum does have a sealing effect versus pressure leaks. The big problem is emptying the system. As noted earlier, opening the radiator drain gets some 30% or so of the coolant out. If
there's an engine block drain, opening it improves
the percentage, and on some engines disconnecting the lower radiator hose from the engine is an
alternative. From there on, it's onto filling the system. You could also flush the heater core separately,

January 2015

Figure 17: Most heater coolant valves can be externally checked to see if linkage moves and hoses can be felt to determine if valve is opening or closing.

7

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
MACS Service Reports - 2015 - JAN3
MACS Service Reports - 2015 - JAN4
MACS Service Reports - 2015 - JAN5
MACS Service Reports - 2015 - JAN6
MACS Service Reports - 2015 - JAN7
MACS Service Reports - 2015 - JAN8
MACS Service Reports - 2015 - FEB1
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MACS Service Reports - 2015 - FEB6
MACS Service Reports - 2015 - FEB7
MACS Service Reports - 2015 - FEB8
MACS Service Reports - 2015 - MAR1
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MACS Service Reports - 2015 - MAR5
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MACS Service Reports - 2015 - MAR7
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
MACS Service Reports - 2015 - JUN2
MACS Service Reports - 2015 - JUN3
MACS Service Reports - 2015 - JUN4
MACS Service Reports - 2015 - JUN5
MACS Service Reports - 2015 - JUN6
MACS Service Reports - 2015 - JUN7
MACS Service Reports - 2015 - JUN8
MACS Service Reports - 2015 - JUL1
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MACS Service Reports - 2015 - JUL3
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MACS Service Reports - 2015 - JUL5
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MACS Service Reports - 2015 - JUL7
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 - 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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