I thought of something else which may be of relevance or not. My bypass involved using the Lima and 2 Veins. After just 3 months, the two Veins completely closed down and I was basically back to square one because the Lima was blocked. I stopped sweating again. So, perhaps it's a good sign to sweat.
I was the same after my triple bypass, and even slight exertion would have me sweating. My Doctor said that a rise in temperature is normal in many people when a lot of healing is taking place. After a few months it settled down again. When I was at cardiac rehab, the nurses used to joke, asking if I wanted a wet suit.