Would any of those cause air to get into the system also? When I had it bled a week a go they couldn't find a leak when they pressure tested. Could this all be part of the same problem or something else entirely? I'm taking it in tomorrow to be looked at for the leak, and wanted an idea of what to ask them? It's not even close to running hot right now. So I'm hoping it just took them 2x to bleed the system over a 6 week period.