To repair a leaking radiator or heater hose—
- Allow the engine to cool so the hoses can be safely handled.
- Patch the leak by wrapping it with standard issue electrical or reinforcing tape.
- Refill the radiator with coolant and leave the radiator cap loosened.
- Operate the vehicle at a reduced speed until the hose can be replaced.
Source: U.S. Army FM 4-30.31, Recovery and Battle Damage Assessment and Repair