Quote:
Originally Posted by RUNNERBUN
I would suggest that this is where your problem lies. Your water pump in good normal condition would be pumping your coolant at a faster rate than it can flow thru your radiator due to radiator being in poor condition. Your coolant will build up in the top tank and therefore out of you overflow.
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You realize that this is physically impossible? No matter how strong your pump is, NO pump can put out more than it can pull into its suction side. However, vacuum (negative pressure) on the engine side will lower your boiling point and then you can get flash steam, which because of its rapid expansion, will blow coolant out of the system. Therefore making sure the radiator flows well raises the pressure in the engine, making for more efficient cooling. Watch this youtube video, Jackson does a very good job on it.
https://m.youtube.com/watch?v=Ug01EW7UZGM
If link doesn't work go to youtube and search model a cooling system.