The actual cost will depend on the brand you choose and the level of damage in your radiator. If the radiator needs higher maintenance, then the mechanic will add a few extra bucks to your repair bill. You can save this cost by fixing the leakage on your own. You only need to pour the coolant solution into the radiator. In some cases, the existing coolant compound needs to be drained before the sealant is applied. But, the application process is straightforward. You don’t need to take the radiator to the automobile shop unless you have zero knowledge of repairing the radiator. If you do it yourself, the total cost you will incur is the cost of the repair kit only. It will be around $45 to $100.