how much to fix a radiator leak?

The cost to fix a radiator leak can vary widely, from $10-$100+ depending on the issue. Most radiator leaks can be fixed by following the instructions in this article. If you’re concerned about the cost of a repair, you can always call a professional to help you.
Repairing a radiator leak is a lot cheaper than replacing it. If you’ve got a radiator that’s leaking then you can replace the gasket on it and that’s going to cost you about £40.
If you go to a mechanic, the cost will be around $90 depending on your car make and model. Replacing a car radiator, however, can set you back over $300-$900. Labour costs involve a mechanic checking for leaks, removing the radiator, a whole system flush and the installation of a new radiator.