Weld the place where it is leaking
Replace the seal.
Find where the leak is. Then seal it. The sealing may take different forms depending on where the leak is.
fix the vacuum leak
We are going to need more info to help you with that one. Describe in more detail where the leak is coming from.
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I have a waterline leak at my home from the street to my home....can I get a grant to fix this leak?
What kind of leak and where is it?
THE WINDSHILD MUST BE REMOVED AND RE URETHANED
You have to determine the source of the leak then decide on how to fix it.
You will have to locate the source of the leak before you can fix it. Re-post with your findings.
There are some oil additives you can get, that might stop the leak. But if the leak has developed, the only way to fix it is to replace the seal.