How do you use JB Weld to repair a 1-inch crack in your radiator?

You should not use JB Weld or any adhesive to repair a crack in a radiator. A radiator is a critical component of your vehicle's cooling system, and using an improper repair method can lead to serious problems, including overheating and engine damage. If your radiator has a crack, it should be repaired by a qualified mechanic.

Here's what you need to do:

1. Stop driving the vehicle immediately. Driving with a cracked radiator can cause the engine to overheat, which can lead to serious damage.

2. Call a tow truck to have your vehicle taken to a mechanic. If the crack is severe, you may need to have your radiator replaced.

3. If the crack is small and in an accessible location, you can attempt to repair it with a metal patching compound. This is not a permanent solution and should only be used as a temporary measure until you can have the radiator properly repaired.