Disconnect
1. Remove the A/C tube lock coupling clip (19E746), if equipped.

2. Fit the special tool to the spring lock coupling.

3. Push the tool into the cage opening to release the female fitting from the A/C tube lock coupling spring (19E576).

4. Pull the spring lock coupling fittings apart.

5. CAUTION: Do not use metal tools to remove the O-ring seals. They can cause axial scratches across the O-ring seal grooves, resulting in refrigerant leaks.
Remove the O-ring seals with a non-metallic tool.

6. CAUTION: Do not use a screwdriver or similar tool to remove the A/C tube lock coupling spring; this can cause axial scratches across the O-ring seal grooves resulting in refrigerant leaks.
Remove the A/C tube lock coupling spring with a small hooked wire.

Test yourself
A quick Ford Mustang quiz: every answer comes with an explanation and a link to the manual page.