I was driving on the freeway and when I got to my exit as I slowed to the yield sign my car died. I noticed my temp gauge almost to the H. I popped my hood to see a crack (8"or so) on the plastic/pvc part that sits on top. I waited for it to cool, filled it and drove it to Napa. Napa was less than five min.away. after my time at Napa, my car had cooled. I put a temp. sealant on so I could make it home. The car didn't start. It almost starts with the first turn over but just won't do it. Any ideas? I'm not a take it to a mechanic type of guy, unless I absolutely have to. Would the water pump possibly cause this?