Slow Radiator Leak

I recently purchased a 95 Sub 1500 (5.7) with 136,000 miles (great shape). I just totally flushed & refilled the coolant system. I have now developed a slow leak which I think is coming from the bottom of the radiator (hard to see & get to in the Winter). All connections seem tight including rear heater and intake gasket was replaced about 2 months ago. Is there any problems in using Bars Leak? Thanks for the help!

It might be the side tanks on the rad. I have had them leak. I suggest if it is leaking there just get a new rad. Barrs will work but when, if you have to change the rad, make sure you flush it out real good. That stuff plugs the heater core.

It might be the side tanks on the rad. I have had them leak. I suggest if it is leaking there just get a new rad. Barrs will work but when, if you have to change the rad, make sure you flush it out real good. That stuff plugs the heater core.

Upon a long & closer exaim I found the culprit I believe, a crack had developed in the nipple that connects the coolant return hose fitting to the top of the engine (just under the distributor) plus the fitting was also leaking. The nipple broke in half when I tried to remove the hose. I have to get an internal pipe wrench to remove the nipple from the engine, replace it and the return hose and hopefully that should do it . . . at least I hope so! Thanks for your responses.

Those little yellow and red tubes of a silvery powder are the best sealant in my experience. I think it's called Aluma-kool, most any parts store will carry it.

Just pour into a warmed-up cooling system with the engine running, replace cap and drive a while.
Works every time, for a long time!

Those little yellow and red tubes of a silvery powder are the best sealant in my experience. I think it's called Aluma-kool, most any parts store will carry it.

Just pour into a warmed-up cooling system with the engine running, replace cap and drive a while.
Works every time, for a long time!

Thanks for the advice which I will use the next time, unfortunitely the "quick connect" fitting that goes into the top rear of the engine (coolant return line I believe) broke off, trying to get it out now to replace.