mid 70's bottem end, 1990 top end, 90 water pump...overheating!!! - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-23-2010, 08:57 PM
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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

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Old 01-23-2010, 09:38 PM
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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
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Old 01-23-2010, 09:40 PM
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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.
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Old 01-24-2010, 07:31 AM
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Agreed, the collapsed hose will cause overheating bigtime, and if it's sucking the bottom hose shut, chances are it's the correct rotation.
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Old 01-24-2010, 07:51 AM
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Or Even a plugged radiator will cause the lower hose to flatten
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