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Chapter 8
– Troubleshooting & Service Procedures
8-6
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IndexIf your AC and heater visual, electrical and leak inspections don’t turn up any
problems, save time by hooking up the manifold gauge set before you make the
performance test. If you find a leak and can correct it easily by tightening a
connection, do so. But if too much refrigerant leaked out, you may have to add
some refrigerant to the system for an effective performance test. We will get
into detail on troubleshooting with gauges after we explain manifold gauge set
installation and adding refrigerant.
Manifold Gauge Set Installation
CAUTION
Never hook up the gauge set when the engine and air
conditioner are running. Be sure all the valves on the
manifold are closed all the way (turn them clockwise).
Check the hose connections on the manifold for tight-
ness.
Locate the low and high side system service fittings and remove their protec-
tive caps. Position or hang the manifold gauge set in a convenient location.
Figure 8-2 illustrates a good example of manifold gauge set hookup in one
service situation.
The manifold gauge set is a necessary tool in troubleshooting AC system
problems. The following steps are performed during and after installing the
manifold gauge set:
1.
Purging Air from the Gauge Set Hoses
2.
Adding Refrigerant to the System
3.
Stabilizing the AC System.
Figure 8-2
A typical manifold gauge set
hookup is shown in this
illustration. The center hose
on the gauge set is con-
nected to the vacuum pump.