Ford 2003 Mustang Workshop Manual page 3121

Connect an R-134a A/C service center to the low- and high-pressure service gauge port valves.
3. Recover the refrigerant from the system following the operating instructions provided by the
equipment manufacturer.
4. Once the service center has recovered the vehicle A/C system refrigerant, close the service
center inlet valve (if equipped). Then switch off the power supply.
5. Allow the vehicle A/C system to remain closed for about two minutes. Observe the system
vacuum level as shown on the gauge. If the vacuum does not decrease, disconnect the
refrigerant center hose(s).
6. If the system vacuum does decrease, repeat Steps 2 through 5 until the vacuum level remains
stable for two minutes.
7. Carry out the required repairs.
Refrigerant System Evacuation
NOTE: Ford Motor Company recommends use of an A/C service center to carry out recovery,
evacuation, and charging of the refrigerant system. If an A/C service center is not available, refrigerant
system recovery, evacuation, and charging may be accomplished using a separate recovery station,
vacuum pump, charging cylinder, and manifold gauge set.
1. Connect an R-134a service center to the low- and high-pressure service gauge port valves.
2. Evacuate the system until the low-pressure gauge reads at least 99.4 kPa (29.5 in-Hg) of
vacuum and as close to 101.1 kPa (30 in-Hg) as possible. Continue to operate the vacuum
pump for a minimum of 45 minutes.
3. Turn off the vacuum pump. Observe the low-pressure gauge for five minutes to make sure that
the system vacuum is held. If vacuum is not held for five minutes, leak test the system, service
the leak, and evacuate the system again.
Refrigerant System Charging
NOTE: Ford Motor Company recommends use of an A/C service center to carry out recovery,
evacuation, and charging of the refrigerant system. If an A/C service center is not available, refrigerant
system recovery, evacuation, and charging may be accomplished using a separate recovery station,
vacuum pump, charging cylinder, and manifold gauge set.
1. Correctly oil match the system to verify that the correct amount of refrigerant oil is present in the
system. For additional information, refer to
2. Charge the system with the specified amounts of refrigerant oil and refrigerant.
3. When no more refrigerant is being drawn into the system, start the engine and select MAX A/C
operation. Adjust the blower motor speed to the maximum and allow the remaining refrigerant to
be drawn into the system. Continue to add refrigerant into the system until the specified weight
of R-134a has been added. Close the charging cylinder valve and allow the system to pull any
remaining refrigerant from the hose. When the low-pressure drops to approximately 207 kPa
(30 psi), close the charging hose valve.
Refrigerant Oil Adding in this section.