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-   -   mid 70's bottem end, 1990 top end, 90 water pump...overheating!!! (http://www.hotrodders.com/forum/mid-70s-bottem-end-1990-top-end-90-water-pump-171911.html)

erickmi 01-23-2010 08:57 PM

mid 70's bottem end, 1990 top end, 90 water pump...overheating!!!
 
i've heard yay's and nay's about the way the wayer pump is spinning on the older style block being a newer style pump...could this be the reason it overhats and collapses the bottom hose

Chevrolet4x4s 01-23-2010 09:38 PM

What type of engine is it? You may be running a reverse rotation water pump standard direction,with the impller spinning the wrong direction it wont move much water at all.
Shane

airboat 01-23-2010 09:40 PM

Answered your own question. It's trying to pump water if it's collapsing the lower hose but you need a better lower hose or spring in it to prevent collapsing because a collapsed hose won't allow flow.

Rickracer 01-24-2010 07:31 AM

Agreed, the collapsed hose will cause overheating bigtime, and if it's sucking the bottom hose shut, chances are it's the correct rotation. :cool:

rockcruiser 01-24-2010 07:51 AM

Or Even a plugged radiator will cause the lower hose to flatten :thumbup:


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