Re: Muriatic Acid to clean engine cooling system

Posted by Tim Cole On 2016/7/17 5:43:03

So called muriatic is HCL or hydrochloric. A better choice is H2SO4 sulfuric used heated. However, I would get the distribution tube out first and flush the block with water because acid will accumulate in any residue and stay there. Cleaning the cylinder head with the acid will probably have a greater impact then the block and if you make a mistake the only loss is a cylinder head.