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How to tell if water Pump is bad?


edj0527
02-14-2006, 05:28 PM
Hey all,
I Have a 2000 silverado 1500 with the 4.8L V8. Since it has a closed coolant system how can you be sure the water pump is bad. Truck is showing me the check coolant temp message in the message center. Shows plenty of coolant in the Tank and the truck runs really hot like 250 to near 260 under normal driving conditions no towing. Any thoughts?

abaird
02-14-2006, 06:30 PM
Let the truck warm up and with it idling you can check the water pump by squeezing the upper hose with one hand(may want to wear a glove) and rev the engine with the other. You should feel a pretty good surge if it is working good.

Elbert
02-14-2006, 07:45 PM
Hey all,
I Have a 2000 silverado 1500 with the 4.8L V8. Since it has a closed coolant system how can you be sure the water pump is bad. Truck is showing me the check coolant temp message in the message center. Shows plenty of coolant in the Tank and the truck runs really hot like 250 to near 260 under normal driving conditions no towing. Any thoughts?

dont continue to drive your truck until you figure out the problem. Water pumps generally have a impeller seal failure...you'll see coolant leaking from what they call the weep hole, its located on the bottom side of the water pump if you are looking at the pump from the top side of the engine. If you see a trail of coolant its time to replace the water pump. I would replace the thermostat while you are doing this, since its an easy job to do, and it rules out further issues. Anything on the upward trend of 230 degrees you need to figure out whats going on, especially in the winter time.

Mork
02-15-2006, 07:00 AM
The only way a water pum will fail is a) seal failure (leaking through weep hole) or bearing failure (audiable rough noise) If the pump shows no sign of eather and the vehiclel runs abnormally hot, it is most often a bad thermostat.

edj0527
02-15-2006, 07:24 AM
Thanks Folks,
No leaking COolant, used the Squeeze method and felt good flow. Changed the Thermostat and all seems to be working well. Didnt drive the truck after the message came up. Once I got all the Air filter cowling out of the way I could get a good look at the waterpump and no weeping or leaking that I could see. Thanks for the help.

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