I have a 2003 ranger, under the hood there is the master cyl. radiator , and a small clear tank with a red cap on it,
it has some kind of clear oil in it and it is low. can you tell me what this is. I don't have a book on it yet.

 

That is radiator coolant .

 

if thats the rad. relief tank, then it shouldnt have clear liquid unless you used straight water.it should be green color (antifreeze) if its stock. it should have a low and high marks on it for the level and have a insert under the cap in it.

 

Thanks, I took a clear hose and sucked some out, It is ani freeze, Makes me feel so dum, Thanks again.

 

Just don't fill it to the max mark. I do mine about half way. That is where it should be to allow coolent to come in if needed.