7. Connecting to the Automotive A/C System
Use the service hose quick couplings to connect the hoses to the A/C system service ports,
bearing in mind that BLUE must be connected to the low-pressure (suction) side and RED to high
pressure (discharge).
If the system is equipped with a single service port, connect only the appropriate hose.
Note: Before connecting the quick couplers, clean the a/c ports of any foreign material.
Winding the quick coupler hand wheel clockwise will allow the refrigerant to flow through the
hoses. Turning hand wheel in opposite direction, the flow will be closed. If there is any refrigerant
in the air-conditioning system, the pressure gauges will indicate a pressure rise.
Note: Console hand valves (4) need to stay closed in order not to allow the refrigerant to
enter the service equipment until the required function has been selected.
The unit gauges (suction & discharge) are important and useful instruments. The operator should
have basic understanding between gauge reading and air-conditioning system operation in order
to correctly diagnose any possible system malfunction.
Set the transmission in neutral, start engine
and turn the air conditioning on. Allow
pressure gauge needles to stabilize and
record the pressure readings.
Gauges reading may show particular
problem or associate to a possible
problems.
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