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Is the engine reaching normal operating temp now that you have changed the thermostat ? Is the radiator full of coolant ? Are the heater hoses getting hot ?
You are correct in your suspicions. The thermostat blocks flow thru the radiator to help the engine warm up. The coolant still flows thru the block with the thermostat closed. If you remove the thermostat the cooling system should flow thru the radiator and stay below 160 degrees if the air temp is below 90. If the thermostat is out and the engine is getting hot at idle speed, either the water pump has failed, or there is another blockage in the engine block.
Could possibly need a new thermostat, the thermostat opens and closes depending on the heat of the coolant. maybe also check your heating core. as well as the quality of you coolant.
what motor do you have? have you change the thermostat lately? check the 2 hose to the heater core ,and see if they are hot. if only one is hot then you have a clogged heter core
More likely it's yr heating pipes let water escape so check these thoroughly. Could be head gasket leaking into engine so chk that immed for any sign of water on the oil stick. Otherwise flush the engine water thru for an oily blockage. Always use coolant. cheers
It's probably air bound. In my 51 years of working on cars I've never heard of a special way to add coolant.
I just put some in the radiator or the container, start the engine, wait for the thermostat to open,then fill it, leave the cap off so it won't get air bound while it's running.
If there is a bleeder valve on top of the thermostat housing, open that until there is a steady stream of coolant coming out, then close it and refill system.
If it still over heats, you might have a clogged radiator.
Is the car actually heating up?Does the radiator boil?Have you looked at the temperature sending unit giving a bad temp.reading.?The thermostat needs looking at and also the head gasket.Hope this helps
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