Look through the passenger side wheel opening - see what needs to be done?
IF it still isn’t obvious - seek *hands-on* help from qualified personnel.
It is unlawful to release any type of refrigerant into the at atmosphere!!
Good luck M
RepairPal Certified shops can diagnose and repair your 2006 GMC Envoy. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.