Both of my ac blower motors' relays went bad. They even melted and damaged the fuse block. Replaced both blower motor relays and everthing works good now but I know I need to replace the fuse block. This happened for no reason, pollon filters were clean as always. My question or concern is the fuse block always seems HOT to the touch after a run. Is that normal? and has anybody had this happen (fuse block damage by relays ) before and what could be the cause??