20-10-2020, 06:33 PM
Hello, can anybody tell what the two small (about 1mm diameter) holes are for in the radiator neck (where the filler cap fits). I have found that when my cooling system gets too hot then it spurts rusty water out of the two holes over the bonnet. I thought that the expanding water should leave the radiator via the overflow tube that can be seen in the radiator header tank but on my car it seem to prefer jetting out of the small holes. So I would like to seal off these holes, any thoughts?