barrs stop leak will work on most smaller holes and cracks if you can not find that you could try silver stopper also found at most part stores
If you can see the crack, you could use some fine sandpaper (when it's cool) and sand down the area to be patched, then wipe it clean, and apply some 'quicksteel' compound- found at most hardware or auto supply stores. JB weld works well, too. Ideally, since quicksteel sets fast, put this on first, wait an hour, then apply a thin coat of JB weld on top, and let it sit overnight before driving. You may even put some stop leak fluid for good measure.
weld it with nylon rod using iron plastic welder.
I do know of a solution to this problem. If the crack is just a small one there is a tablet you can get at any Automotive Repair store. It's called Radiator Repair its a small "tablet" you drop in your radiator and let the car run, as it warms up you will notice the crack disappear. Other than that JB Weld is a good bet if you know where the leak is generating from.
what should i use to fix a small crack on top of radiator. on a 1998 ford ranger what should i use to fix a small crack on top of radiator. on a 1998 ford ranger
If the radiator tanks are plastic you will have to replace the radiator.
Need a product to repair crack in fiberglass underwater, and keep it from spreading.
plaster of paris can be used to repair a crack in a drywall.
A new radiator.
With a tube of aluminum crack fixer.
I had 2" crack on top of the radiator. I tried JB Weld and other similar putty but they did not work on plastic. I bought Permatex PermaPoxy™ 5 Minute Plastic Weld from Advanced Auto Parts for $7. It took 10 minutes to finish the job and it worked.