[30 Closed Cab PU]

I had a lot of rust/scale, left it in for days at a time and running the truck on a few trips each day. If you have the original design Water pump it will flush out the grease in the packing nut, and you can end up with a mess of rusty hot vinegar all over your engine bay, and may leak through your hood vents, hard on the paint.


If you use vinegar you may want to install an upper hose coolant filter, check clean often. Vinegar will loosen rust flakes and a lot of rust that can clog your radiator


Always backflush with filter out first, then if desired flush. Goal is keep from plugging up the radiator.


I used straight vinegar, others recommend 50/50 with water.


When done you need to do a final treatment of water/baking soda, run your A with it in, and backflush. Vinegar is acidic, and continues to work even if flushed/back flushed with water. Water/baking soda neutralizes it.


If you were to use rust911,thermocure, or evaporust - they "dissolve" the rust. No flakes or large particles. It is safe on all metals, not acidic like vinegar. No need for a water/baking soda treatment. A detergent treatment (like Water/Dawn , or water/Arm and Hammer Washing Soda) should 1st be performed, Rust911/etc. will not remove grease oil, and will block the Rust911/etc. from working.