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2001 Chevrolet Silverado 5.3L 4WD overheating after changing waterpump

2001 Chevy Silverado 5.3L 4WD. I changed out the water pump (opted for a new one, not remanufactured) and changed out the thermostat. I slow filled the return container with antifreeze until I saw no more bubbles. I turned on the engine and let it run for about 10 minutes. The engine temperature went to 250degF in no time. Killed the engine and felt the top hose. It was tight and so was the bottom hose. After scratching my head for a while, I took the cap off the return container and added a gallon of water. I put the cap back on, started the engine and got the same overheating. I took the new thermostat off and put the old one back on (which is only a year old) and went through all the steps above. Same thing. I let it cool down, and when I went to take the cap off, it blow off and sprayed water all over. Thank God the water was only warm and not hot. I got mad and went inside to cool off. And here I am typing out this problem with no idea what is going on.

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  • crosswalker Jun 03, 2009

    I replaced the water pump because it was leaking. The engine never overheated. I have since changed the water pump and thermostat again ( the local auto parts store has been extremely helpful :ABC Auto Parts) but I am still overheating. The radiator does not have a radiator cap. I have a reservoir / return bottle with a cap. I am getting hot now right as the thermostat opens up and I am thinking head gasket (although I never overheated the engine).

  • Gary woods Jul 28, 2013

    Same problem pulled heads took to-machine shop nothing wrong put back together same problem so don't pulled heads

  • Gary woods Jul 28, 2013

    Also did check for exhaust gases in over flow jug has none

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If it is building that much pressure that quick
then i would say that you have a head gasket problem
why did you replace the water pump cause of a leak or becuause it was overheating?

Posted on Jun 03, 2009

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When you replaced your water pump you drained all your coolant now to top it off leave the cover off your tank cause as your thermostat opens it will allow more water to enter your block. keep topping it off till it doesnt drain into your block anymore. this will be a while since when you add water it cools your thermostat and closes and will reopen when reaches temp.

Posted on Jun 03, 2009

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Two possibles,the thermostat is in backwards and I really doubt that,by your post you seem pretty knowledgable,but its wortha check to see if the spring assembly is pointed towards the motor and not the radiator,the second would be an air lock in the cooling system,try running the system without out any pressure on the system this should allow any air to work its way through.

Posted on Jun 03, 2009

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Instead of filling the overflow container first, open the radiator cap... it's a tight fit... do it when the car and you have cooled off (ha!) and fill the radiator.. then fill the overflow to just below the add line...run it and let it warm up... did it help?
It may back some coolant out... but then equal out..

Posted on Jun 03, 2009

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Remove coolant return hose from tank 2 read iator see if coolant comes out radiator side if not then radiator is clog try back flushing with water hose and some clamps if not try replacing radiator back flushing worked for me. Symptoms was overheating no heat and radiator hot on one side and cold on the other top hose hot lower cold after water pump and t-stat was replaced I removed the return hose and nothing came out the radiator

Posted on Oct 09, 2014

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Don't do that, it'll just get you burned, if your heater isn't working first check the interior air filter. You have to remove a large black cover from the passenger seat. Once off just pull towards u on the obvious spot the filter is in. Then look to the left and you should see a black plug with wires coming from it. This is your heater relay. Unplug it, inspect it and start the car while still unplugged. Turn your heater on and plug it back in. My Tahoe had the same problem, clogged air filter and a filthy relay plug.

Posted on Jun 21, 2013

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Im having the exact same issue with my 04' tahoe with a 5.3l Did you find out anything

Posted on Sep 21, 2010

  • daddy_van Jan 02, 2011

    i also having the same issue with my 04 tahoe with the 5.3l. it started to overheat and not blow any hot air. i replaced the thermostat first and had the same issue. next i replaced the water pump. still overheating. it was apparent when i pulled the water pump that it was not pumping fluid. now it is but is still over heating and blowing cold air. i have heard of filling it up by pulling the top hose of the radiator at the radiator and filling it there till it comes out. i helps avoid the air bubbles. but why would the heater still blow cold air. im hoping its not the heater core

  • Gary woods Jul 29, 2013

    Replace the radiator fix my truck

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