After a car crash with multiple facial fractures the right side of my face is numb i can still feel hot/cold/pain will the feeling come back ?

It is possible: All depends on the severity of nerves injury in the face, some those injuries are reversible and are not.

Usually: With significant facial fractures to the mid face area, there is usually some trauma to the infraorbital nerve which gives feeling to the mid face/cheek area. The combination of the trauma and subsequent surgery can "put this nerve to sleep". It can last for weeks to months. In rare cases, the nerve may have been completely divided, in which case the numbness may be more permanent.