Over heating causes it to shut down 2 cyl n run on 6 cyl to help cool it down but once that happens the best is to shut it off check the cooling system check for antifreeze make sure its full then take the ground off the battery that's in the trunk beside the spare tire n leave the postive on but take off negative n leave it off for 5 mins then hook it back on it will turn the safe mode off back to normal. That's what I did to my 04 lincoln LS v8 3.9l... hope this helps ya