well i guess i am loosing coolant somewhere.....the overflow resevior is lower and lower. where should i be checking for the leak???? (91 3.1, auto)

 

well coolant evaporates too, how much are you loosing?

 

You have a leak, check the weep hole on the fly wheel cover to see if rear freeze plugs have gone thru, that was my problem.

Other spots for leaks are the plastic end caps that crack and only leak when it get hot. Of course the obvious houses and water pump.

 

Do you see coolant on the grount or no? Steam coming from underhood? Over the past three days I had a pinhold in my upper radiator hose and a pinhole in a heater hose.

If you take your car out for a long drive, check it right after you park when pressure is high. That is how I spotted mine.

 

Do what this guy says, fill up resevoir, take for a long drive, and park it in a paved lot, get out and wait and watch for leak. If you loosing it steadily, you will be able to see a leak within 2-3 minutes.