2002 A 6 Avant Quattro 3.0
 

So I was run off the highway, destroyed my front clip, radiator and oil pan! I replaced all 3, no leaks. Temp is in the middle where it should be, yet my overheat (IDIOT LIGHT) comes on, goes off, is it just a glitch, thermostat, ormaybe I need a flush? Also, is anyone else having problems with the fuel tank? It leaks gas when level, yet rear end facing down no leak, any suggestions? It almost feels like a ghost in my car, the windows go up and down by themselves and now my alarm goes off without notice? Is there a short and best way to find/ diagnose? Thanks. I have 162,000 on it, got the top end done at 119,000, other than these issues, I love it! Thanks!