Drain the engine coolant when it has cooled. open the petcock on the lower end of the radiator and drain it into a bucket. [2] 3. loosen the clamps on the leaking radiator hose. 4. grab hold of the hose and begin to work it off of the end it is attached to. [3] remove the hose clamps from the leaking radiator hose. Remove the radiator cap and pour the contents of the leak sealant directly into the cooling system. top it off with a coolant and water mixture if your vehicle’s engine is currently low. replace the radiator cap and start the engine. the leak will seal as the sealant makes its way through your coolant system. [10].
Begin by identifying the leaking radiator hose that needs to be replaced. do this by running the car to operating temperature. park the car on level ground with the engine running in park and emergency brake set. with the car running, visually inspect the hoses for collapse or leaks and do the same thing with the engine off. 4. apply epoxy or sealant. if the leak is coming from the radiator tank or a small crack in the radiator body, there are a couple of temporary fixes you can try. 'apply epoxy putty or sealant to plug minor leaks or cracks,' advises shlomo cherniak. 'to do this, clean and dry the area around the leak thoroughly. Slide the hose over the connection on the radiator. use a pair of pliers or a screwdriver (depending on the clamp design) to tighten the hose clamps. if you’re replacing both upper and lower radiator hoses, repeat the steps above on the second hose. otherwise, move on to step #7. Step 2: install the radiator hose. slide the hose onto the connector. then, position and secure the clamps at least 1 4 in. (6.35mm) from the ends of the hose. check to ensure the clamps are located beyond the raised bead of the connector and then tighten them down. step 3: refill the radiator.
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