Drinking too much water is one potential risk as extreme heat returns to more parts of the country. In another case, a couple died after their air conditioner failed. ABC News’ Rhiannon Ally has more. WATCH the ABC News Live Stream Here: youtube.com/watch?v=w_Ma8oQLmSM SUBSCRIBE to ABC NEWS: bit.ly/2vZb6yP Watch More on abcnews.go.com LIKE ABC News on FACEBOOK facebook.com/abcnews FOLLOW ABC News on TWITTER: twitter.com/abc #abcnews #heatwave #risk #overhydration