Quote Originally Posted by sideshow24 View Post
2002 Subaru Outback. Small leak from a freeze plug is dripping onto the exhaust. I'm not losing much coolant at all but the smell is pretty bad once I stop the car. What are your thoughts on block sealer? Is it effective?

A few I looked at require flushing the coolant system completely since coolant interferes with the sealing process. Is draining the radiator and overflow tank and flushing them with water enough or do I need to do more?
Is the freeze plug readily accessible?

If it is, i'd just replace it and not worry about using the "stop leak". I am mostly against stop leak when a normal repair can be done without too much trouble.

I try to stay away with any sort of block sealer because they have the potential to cause problems. Not saying that they will cause problems, but I'd rather make a repair without having to add something to my cooling system that may or may not help.


If the freeze plug doesn't require hours of labor to replace, why not just replace it instead?