III-85
If 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
Never hook up the gauge set when the engine and air con-
ditioner 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 tightness.
Locate the low and high side system service fittings and remove their protective 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.
Troubleshooting & Service Procedures
CAUTION
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.
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