RE: Radiator Hose collapse when engine is revved. (?)
a 50/50 mixture of coolant and water is recommended. But if you live in an area of the country where it doesn't freeze, you should be alright. Also, ethlyne glychol antifreeze (the green stuff) has properties in it that are specifically designed to lubricate a water pump. But then again water is a natural lubricant as well. If you live in an area of the country where it freezes, you need to balence out your mixture. I'd recommend getting an antifreeze tester. They are available at any auto parts store for a couple bucks. It looks like an eye dropper with some colored ***** in it. If you don't want to completely drain and fill your system again, you can simply draina small amount of fluid out of the radiator and pour straight antifreeze in to replace it. Run the engine to mix everything up, and check your coolant mixture with the tester. Repeat until you reach the desired mixture. But this could take awhile, and it's a lot of guess work. Personally, I'd drain the system and refill just to save time.