Question about 2000 Chevrolet Silverado

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2001 chevrolet pickup v6 overheating after changing waterpump

We changed the waterpump because it over leaking, and then changed the thermostat and now its overheating and don't know why

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  • omdouglass Jan 05, 2009

    The coolant isn't running thru the motor at all. I have run the truck without the radiator cap and coolant is not flowing at all. Plus now the heater blows only cold air and it never did that before. ??

  • omdouglass Jan 05, 2009

    I took off rad cap and kept the engine running, but it heats up so fast that I have to kill the engine. I didn't see any bleeder screws around the heater hose.



    I do appreciate any advice though.



    Thanks

  • omdouglass Jan 05, 2009

    Thanks, I will try it

  • Phil Goncalves May 11, 2010

    Hi there.... When you filled the rad with coolant, did you purge the system of air? If you didn't this could be the problem. With the rad cap off, let the engine warm up to operating temps and allow the thermostat to open. You'll start seeing the coolant flow through the rad. let it run for 10-15 minutes after it's warmed up and allow all the air to escape. top up the rad with coolant and put the cap back on.

  • kevin smith Dec 01, 2012

    I tried this and it sitll isn't working... I also can't locate the bleeders... no what?

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If you are not getting heat now, it's because you have an air lock in the system. sometimes it can be difficult to burp the system. try turning the heater on high in the defrost position. run your vehicle with the rad cap off and keep the engine running at about 1500 rpm. That should give the waterpump enough momentom to purge the air through the engine. check around the heater hose area and around the thermostat area for any bleeder screws ( sometimes these vehicles will have 2 or 3 for ease of purging the air). hope this helps and if you need any other info please don't hesitate to write.

Posted on Jan 05, 2009

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Have you Checked the Fan Clutch? Does it have an Electric Fan Also for Cooling?

Posted on Jan 05, 2009

  • Travis Humphries
    Travis Humphries Jan 05, 2009

    You Probably just got a Bad Pump. Get another Water pump and go back to Step one. This happens Occasionally even when they are New.

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