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2004 gmc savana is overheating

Replaced water pump and thermostat. Upper hose is hot, lower hose is cool.

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First are you sure the thermostat was installed correctly if so you have to have a blockage it could be that your new thermostat is bad it dose happen but again you sure the t. stat is not up side down dose your heat blow hot? probly not if lower hose is cool only thing left is the radeator is pluged look in it at cap do all the ports look open its posable your air locked you should have a bleader valve may be on or neat t.stat or on intake open itand run you can leave rad cap off or louse if at 200% its not sirculating i would pull t. stat out and run it with out one just as a test

Posted on Apr 19, 2013

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Posted on Jan 02, 2017

keemo68
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SOURCE: Overheating

the upper hose is suppose to be hot this lets you know that the thermostat is working like it should. if it were cold that would indicate that the thermostat was bad. i would say that it's the water pump because your not getting the circulation if it were a blockage your upper hose would still be cool as well.. hope this helps please rate...thanks

Posted on Sep 05, 2008

localwonder
  • 6784 Answers

SOURCE: Bublling in the thermostat housing and very hot upper radiator hose

I recommend flushing the radiator thoroughly if not done recently. there seems to be some sort of blockage in the radiator at this time. if you get lots of metal fragments that are flushed out during this flush, i will then recommend a rebuild on the radiator or replacement of the radiator. make sure the cooling fans are cycling on time as well.

Posted on May 21, 2009

  • 973 Answers

SOURCE: i had the cooling system flushed then replaced

Check to make sure the cooling fans are turning on.

Posted on Jun 19, 2010

angelo_mlc
  • 1035 Answers

SOURCE: 1989 chevy 4.3 liter V6

Hi. A lot of work has been done with the engine. I guess all was left is the head gaskets. Try replacing the head gaskets. I provided you a link for better understanding. Please click here.

Posted on Sep 21, 2010

  • 65 Answers

SOURCE: Ok, g35 coupe 06,52k miles Had

Heres a couple of things you can check. Start your car and remove the radiator cap,(before it gets hot mind you) when it reaches norm operating temp, look inside radiator to see if water is circulating. If its not moving, its a bad water pump. Also, youre hoses should never collapse, if they collapse when they get hot maybe you need new hoses? Finally, if those dont work, flush out your radiator. Open the bottom cockpit and use a garden hose and let it flush out the system while the car is running, about 10 mins should do the trick. If the radiator looks clean inside then it doesnt need flushed.

Posted on Jan 04, 2011

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That is normal, it will not get hot without the thermostat. The water cools in the radiator and falls to the bottom and the bottom hose is cold. This is what cools the engine and stops it from overheating.

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Ok, g35 coupe 06,52k miles Had over heating problem in april 2010,replaced thermostat, all's well. Now Jan 2011 overheating again, noticed upper & lower radiator hoses collapse, changed thermostat...


Heres a couple of things you can check. Start your car and remove the radiator cap,(before it gets hot mind you) when it reaches norm operating temp, look inside radiator to see if water is circulating. If its not moving, its a bad water pump. Also, youre hoses should never collapse, if they collapse when they get hot maybe you need new hoses? Finally, if those dont work, flush out your radiator. Open the bottom cockpit and use a garden hose and let it flush out the system while the car is running, about 10 mins should do the trick. If the radiator looks clean inside then it doesnt need flushed.

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Then replace the thermostat, because if on lower hose not hot and on upper hose scalding hot = antifreeze flow blocked by the thermostat wich remains closed!!!

Thermostat replacing:


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Car is over heating changed thermostat water pump isnt leaking or making any noises


Ok well there are a number of possibilities. One to keep in mind is that some water pumps are really cheap and the fins will corrode and rust off leaving nothing behind to actually pump the water. If the pump really is working fine then there are two more possibilities. 1 the radiator is clogged, 2. there may be a head gasket leak. 3. you are sure your gauge is working right? 4. you didnt say what year or kind of car it is.. Is the electric fan working? When the engine is overheating, are both upper and lower radiator hoses hot? If the water pump or the thermostat are failing the upper radiator hose can be hot while the lower can still be relativly cool. If the radiator is plugged or the fan isnt working then both hoses can be Hot. There is also a remote possibility that water passages in the head gasket could be plugged.

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Overheating


the upper hose is suppose to be hot this lets you know that the thermostat is working like it should. if it were cold that would indicate that the thermostat was bad. i would say that it's the water pump because your not getting the circulation if it were a blockage your upper hose would still be cool as well.. hope this helps please rate...thanks

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