My girlfriend always tells me that I'm the most unobservant person she's ever met. Well I think I proved her right today. I looked under the hood again for the 1 millionth time and for the very first time I noticed there's no radiator resevoir or overflow tank!!! Shouldn't there be one? And where would it be located in a 1991 mustang?

 

Yes, to the right of the fan shroud, it bolts to the shroud

 

yes there should be one but it isn't necessary, my convert has run without overheating issues for a year now, but i also have an aluminum rad from a grand marquis and fan from an '84 ltd squad car

 

Well that makes sense. I don't have a shroud either! Well I took it off and threw it away cause it was broken in half.