@vtjc Thank you very much for the info. Great advice! I will try to source some plugs instead of using a bypass hose. I've actually used that link before. This is the 5th time I've winterized it, and always put antifreeze into the heater core. That part isn't a big deal. I read that these heaters can have a short life. My plan was to not replace it if it fails. Grabbing a sweatshirt would be easier than replacing something we almost never use. Our previous 1994 had a heater as well. We rarely used that one, and I think I used the current one once last summer. I live in a colder climate, and we almost always ski early morning with air temps in the 50's, water temp in the mid 70's at best. The heaters work great when under speed. However, after 30 seconds or so of running at idle, all it does is blow cold air.