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JtownJoe · 05-29-2018, 08:11 PM

Hi, I have a constant seep of antifreeze from the top of my top radiator hose to neck connection.
I've tried new hoses but found the problem to be a few VERY SMALL dings or flat spots on surface in the radiator neck.
I Tried all the usual steps, a little grease on the outside of the neck & etc but nothing seems to cure it, I am afraid of over tightening the hose clamp any further and damaging the neck so I thought a sealant or Permatex gasket maker on the surface might help but I'm of course cautious about using anything that might adhere the hose to the neck and make a later hose removal a big problem.
I have 4 or 5 types of Permatex Products in the garage, Ultra Copper #101BR, Ultra Black #82180, Black Silcone#81158, Blue RTV #6B & Red Hi-Temp RTV#80726. Anyone have a suggestion on best choice? (Or other suggestions?)
I don't want to take a chance on cracking or damaging the neck to tank solder joint so I'm not wanting to take out the radiator for attempted repairs unless all else fails.

05-29-2018, 08:11 PM	#1
JtownJoe Senior Member Join Date: May 2010 Location: Johnstown, PA Posts: 342	radiator hose sealant Hi, I have a constant seep of antifreeze from the top of my top radiator hose to neck connection. I've tried new hoses but found the problem to be a few VERY SMALL dings or flat spots on surface in the radiator neck. I Tried all the usual steps, a little grease on the outside of the neck & etc but nothing seems to cure it, I am afraid of over tightening the hose clamp any further and damaging the neck so I thought a sealant or Permatex gasket maker on the surface might help but I'm of course cautious about using anything that might adhere the hose to the neck and make a later hose removal a big problem. I have 4 or 5 types of Permatex Products in the garage, Ultra Copper #101BR, Ultra Black #82180, Black Silcone#81158, Blue RTV #6B & Red Hi-Temp RTV#80726. Anyone have a suggestion on best choice? (Or other suggestions?) I don't want to take a chance on cracking or damaging the neck to tank solder joint so I'm not wanting to take out the radiator for attempted repairs unless all else fails.