[viper spray]

I checked the blue cap and it was full of freon just like you said..does that mean it is leaking from there or what?

If it is bubbling then it is leaking, it may be wet from the recent service, clean it and replace the cap and re-check it if you see no bubbling. It may be that the valve is leaking a small amount like a tire air valve would if the valve core is bad.