1990 Silverado 350....The upper radiator hose is observedcollapsing when engine is revved. There is really no pressure on it when the engine has been at temperature. We also noticed that the water in the radiator, when the cap is off, rises up and spills over, then completely disappears. It does this repeatedly. Radiaitor was recently replaced. Engine gets up to temperature, 180-190like normal, and does not run hot.

 

low coolant will cause the hose 2 collapse. u could also have air in ur cooling system.

 

Yeah, we tried to fill it, but it regurgitated everything we tried to put in. We got a water pump...$25.00, 2 hours of labor, no cuts or burns. We're going back this evening to leak check after the silicone dries. Will let know.

 

Got the job done. Tight no leaks...no collapse of hose. Is 25%coolant %75 water too dilluted? Will too much water tear up a water pump?

 

yea that's to much water.. u need at least 50/50 mix to get the best cooling and freeze protection. and no to much water won't mess up ur water pump.

 

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.