Bar's stop leak....

[rcb280z]

That's what I like to hear Tomo.

[rcb280z]

So all is good, I thought. Drove the Z around then parked her in the garage and when I came back out a couple hrs later there was a softball sized puddle on the garage floor right under the radiator. My heart sank! I don't need this I thought to myself. Popped the hood and saw coolant on top of the radiator around the fill neck. Checked the cap and it was tight. Pressure tested the cap and it held (didn't take it beyond 15lbs). It is rated at 13lbs. Snooped around and couldn't find the source. Even made sure the overflow line was tight at the fill neck. Then I decided to remove the overflow line and blow through it. Well it was plugged! Guess what with? Yep, Bar's! Now I'm worried. What else is it going to plug up I wounder. I will probably think about it every time I drive it. I will try my best to stay optimistic though.

[TomoHawk]

The Bar's Leaks did it's job- stopping up the hole...

[Zed Head]

Then I decided to remove the overflow line and blow through it. Well it was plugged! Guess what with? Yep, Bar's!

I had the same issue for a little while. Leakage around the radiator cap. You solved yours faster than I solved mine. The hole in the cap of the overflow bottle is tiny, much smaller than it would seem necessary. I reamed mine out a little with a drill bit. Later (recently) I bought one of those pressure-releasing radiator caps so that I can test the system with a short pressure blow-off, along with being ready for any quick repair work. Bubbles in the overflow bottle means everything works. One way at least.

[Stanley]

JB Weld can work if the leak is accessible. Got a leak (Chevy truck) on a July trip to a remote desert area near Tucson about 12 years ago. Drained and saved the coolant, put some JB Weld on the leak. Surface prep is important. It survived the trip back in 115 F weather and is still OK.

Found the Z's intake manifold heater tube completely plugged with the PO's stop leak. Had overheating problems until I installed a new radiator, it was probably somewhat plugged. Before putting in a new radiator, flushed the engine 3 times.

[scotts pearl]

gm at one time used bars leak or something like it to help seal coolant from factory.. i have used before with no problems.. used in my 2004 jag because i could not find were coolant was leaking... no leak since... jag only has 30000 miles i would not use in old partially clogged radiator.. just my 2 cents

[rcb280z]

Everything seems good today. I am relaxing a bit now. No leaks after 2 trips in her. Fingers crossed.