Are there any no surgical treatments to fix a torn acl?

No: Non surgical treatment for acl ruptures includes physical therapy to stregthen your hamstrings as well as wearing a brace that stabalizes your knee. The acl will not heal on its own but many people can live a normal active life without having their acl reconstructed.

Yes but be careful: When you tear an acl, a person often feels as though the knee went the wrong way. The knee will swell. Later after recovery from the pain and swelling of this first injury, the knee often feels great. The symptoms then are of recurring instability like you don't trust the knee or it gives out. If the knee continues to give out, other structures will be damages and the risk of arthritis increases.