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Could this be a water pump problem?

This is a discussion on Could this be a water pump problem? within the External Engine forums, part of the LSx Technical Help Section category; Well, my car hasn't done this till about 2 days ago... My car actually starts right up now!!! Yay!!! That's ...

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    Formy4Ever Red4Mula's Avatar
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    Could this be a water pump problem?

    Well, my car hasn't done this till about 2 days ago... My car actually starts right up now!!! Yay!!! That's beside the point.. But anyways, my car will get up to op temp, then while at a stop light, or parked it starts rising all the way to the red 260* I think?.. Then while I drive the temp drops back down to about 180*....
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    Member jimmy77611's Avatar
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    Member jimmy77611's Avatar
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    If it's full of coolant, and there's no air in the cooling system, then it is probably the water pump. You might try changing the thermostat first though. I have seen them stick partially closed and cause a similar problem. Be sure you bleed all of the air out of your cooling system. I assume you have an LT1, and those can be a pain to purge the air out.

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    Formy4Ever Red4Mula's Avatar
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    Quote Originally Posted by jimmy77611 View Post
    If it's full of coolant, and there's no air in the cooling system, then it is probably the water pump. You might try changing the thermostat first though. I have seen them stick partially closed and cause a similar problem. Be sure you bleed all of the air out of your cooling system. I assume you have an LT1, and those can be a pain to purge the air out.
    Yeah, it's full of coolant, I recently changed the T-stat about 2 weeks ago..

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    Try letting the car run and remove the cap on the radiator, if there is any air in the system it will eventually work its way out. My car did the same thing at one time and i let it do that for about 5 mins and it droped back down to normal temp. Also might want to check the temp sensor connection.

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    The Bandit Wesman's Avatar
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    Has it left any coolant on the ground?? An early sign of waterpump failure is coolant dripping from the weep hole at the bottom of the waterpump. If the bottom of the waterpump is wet with coolant, or you can see it dripping/collecting below the waterpump, it needs to be replaced.

    If you don't see any coolant coming from the waterpump, you could try changing the thermostat first, it might be stuck closed. If you can, pick up a "failsafe" brand thermostat, they are designed to only stick "open" when they get worn out, instead of getting stuck closed and causing the engine to overheat.
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    Formy4Ever Red4Mula's Avatar
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    K, i'll try that.. I've let ti run before w/o the cap on before I put the new T-stat on their to get rid of any excess air.. But i'll do it again, and get a new t-stat, thnx for the help guys.. Oh and also, no coolant is leaking..

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