A motor vehicle air conditioner heat exchanger has two spaced apart parallel headers joined by two spaced apart parallel channel members. Flow tubes extend between the headers. A nonmetallic bracket is mounted at each of the corners. Each of the brackets has a socket that slides over one of the headers. Each of the brackets has a flange that slides over one of the channel members. The flange has a resilient tab that snaps into engagement with an edge of one of the channel members to retain the bracket.