I noticed my low coolant light came on the other day, found the coolant was low in the radiator about 3-4 inches, light went out & stayed out, but on my way home from the track it came back on about 15 miles from the house (total round trip 120 miles), i checked the fluid this morning & it is down a good 8-10 inches in the radiator, i can't find ANY leaks anywere, the pass floor is dry, i don't smell antifreeze while in the car, the oil is nice & clean, so i'm stumped , i'll re-fill it again & see what happens, any idea of what to check?

 

Is your overflow tank full? If so, change your radiator cap ~ the valve is not allowing the water to be pulled back ~ I've had this happen twice on my 94 Z (180,XXX miles).

 

180,000 miles huh! wow thats nice, now I'm not so worried about my car goin soon 111,xxx miles. I thought these died around 150k

 

??? These are V8's - of course they wont last if they're dogged. I've
had a V8 go over 300k miles and a V6 go over 225k miles. The Z
has 156k miles now and she's still really strong!

 

as long as you keep up regular maint then it should go as long as you keep on top of it!! i know a few guys here in tucson that have close to 500k miles.

 

I think this might be the cause, because the overflow is full & the cap looks old, i'll change it tomorrow.

Now that we have gotten on the subject of mileage lol, my pig has 157,XXX on it, & just pulled off a 13.7 @ 101 last night on a so-so 2.17 60ft. with street tires & bolt-ons , these are by far a great engine, especially if there taken care of like this one was.

 

It also could be the overflow hose and/or grommet causing a leak, thus not letting the coolant to be sucked back in - instead it is sucking back in air.

 

start looking for steam out the tail pipes. im afraid those were my exact symptoms when i blew my head gasket. im in the process of installing a cam and other upgrades since i had most of the engine disassembled.

 

I would borrow a pressure tester from AZ and look and listen for leaks.

 

500k?! I find it hard to believe but i guess it makes sense if you keep up with everything and do a lot of preventative maintenance.

 

No steam in the pipes, no water in the oil neither, doesn't run hot, no exhaust smell in the radiator.

 

I had a problem like this and after thinking I blew a head gasket I noticed there was a crack in my rad on the tank under where the cap is. There was no coolant smell and it never left a puddle. The crack was so small only steam got out when I was driving. I felt like an *** for missing it for a few months but I was happy to see it wasn't anything major.

 

Check the hose under the battery thats where mine was going.Was showing no signs of leaks or anything sitting

 

Some cars have problems with the head gaskets....