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How can I tell if my water pump is bad? - Cars & Trucks

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Posted on Jan 02, 2017

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SOURCE: how to tell if water pump is bad 3800 gm

The 3800's also had other problems. And also Issues for those that are unaware.

Be aware that there are bleeder screws to bleed air out of the system when filling the coolant. With out properly bleeding the system the coolant can Vaporlock in the system causing overheating.

Also if it has been over heated you need to check for a blown head gasket. Smell the antifreeze, if it smells burnt you should be concerned. Next with the engine cold and the system properly bled, leave the radiator cap off and start the engine, if it bubbles constantly or bursts out of the open radiator cap, seek diagnosis at your local repair shop as they have the equipment to do so properly.

I also suggest using an Infrared Thermometer to check temperatures with. if the engine is at 230f and the upper hose is at 200f, and the lower hose is still cool you likely have a clogged radiator. If the upper hose is cool as well then you have a bad water pump or t-stat. if the upper hose slowly warms, and you start to get bubbles then it's likely a water pump with the fins eroded off by electrolysis (gotta change that coolant at regular intervals)

Also make sure the radiator fans turn on.

Posted on Mar 21, 2014

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Hi there
A bad or worn water pump ,you will either boil the engine water system or loose water or coolant while driving and when you stopped or water [temp] light will come on when it gets down in the header tank,AND
you will hear the grinding noise as soon as you start the engine and the water pump pulley will move about when running and water will start leaking .
Let me know how you go.

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