Only a guess but assuming the hoses also are new, there are small water ports that run through your engine block and heads to provide cooling in between the cylinders. If the mentioned items were replaced due to a leak or leaks in the system, then there was probably some form of "radiator sealer" or "stopleak" stuff used which could then seal those small ports. Unfortunately this is not uncommon as they sell stuff to plug "larger" leaks and it ends up plugging the small ports. They sell radiator flush that you run in your radiator for a set time period, it MAY help bring some of that stuff out of the block. My advice is whether or not you use the rad flush stuff, take it to a reputable shop in your area and have it hooked to a machine that will completely push water through and flush the entire system.
I just had mine replaced. It is located at the end of the top radiator hose on an LTZ model. I just had mine replaced. It is located at the end of the top radiator hose on an LTZ model.
In the connection at the radiatorhose and waterpump Follow the upper radiator hose out of the radiator. When that hose connects to your engine, the thermostat is in there.
Should be in a removable housing at the engine end of the upper radiator hose
The thermostat on a 2004 Chevy Venture is changed by draining the radiator, removing the upper radiator hose, and unbolting the thermostat housing. The old thermostat and gasket can then be removed and replaced.
Look where the top radiator hose connects to the engine(water pump).
right on top on the intake. it is where to top radiator hose connects to the motor.
Follow the upper radiator hose to the engine block. The part the hose is connected to is the thermostat housing. The thermostat is under it.
it is at the end of the upper radiator hose inside the metal house the hose connects to
Its located under the throttle body or follow the upper radiator hose til it hits a semi round housing. There is 2 bolts to remove it. First you have to drain the radiator fluid of course. I am changing the thermostat right now on my 2001 Chevy lumina and I see I will have to also remove the throttle body to get to the thermostat housing
There may not be one, My 2000 Lumina has a plug on the lower drivers side of the radiator that can be replaced with a petcock. Rather than do this I removed the lower radiator hose to facilitate flushing the cooling system.
where is the drain plug on a 99 Chevy lumina where is the radiator drain plug on a 99 Chevy lumina I am not completely sure about the 99 but I drive a 95 lumina and the radiator drain plug is located to the right of the radiator (if you are looking under the hood) and at the bottom of the housing for the radiator. Mine is white in color.
If it has the 3.1 engine, it will be on the driver side of the car below the throttle body. Just folow the radiator hose to the block and you will find it.