Allways a bad idea to use things like rad weld.
Stops the leak, initially, so you use it again. same.
What happens, over a period of time, it builds up.
Terrible to get rid of.
I do car air con, same thing, use one of the seal and fill jobs. Yes it solves the imediate problem. BUT over time no good, I have to use special filters, incase some one has used an aditive. Cost me more, SO costs you more.
Get the leak fixed.
sheepdog
September 2009