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If you have a back flush kit on the engine, use it to fill the engine. It will help push air pockets out of the block. Fill it with water, then run the engine until the t/stat opens and air is pushed into the radiator. Add water until the radiator is full. Run engine long enough to be sure there are no more air pockets in the block. Let engine cool a while then let water out of the drain petcock until enough water is let out to make room for antifreeze. Add antifreeze then run engine until t/stat opens again . Top off radiator with more antifreeze.
When cold fill the radiator with water and leave the cap off. Make sure that you have all the air out.
Start the car and watch the radiator, you are looking for air bubbles coming out of the radiator. If you have a steady stream of bubbles appearing you have a blown head gasket.
The sloshing noise may be caused from air in the cooling system.
If there's air in the system, it ends up in the heater core because it's the highest point in the cooling system. When you accelerate, the water pump spins faster pushing coolant into the heater core forcing the air out causing the sloshing noise.
To remove any air from the cooling system, get the engine up to operating temperature. With the engine idling loosen the upper radiator hose clamp. take a small flat bladed screwdriver and slip it between the upper radiator hose and the radiator hose neck. Allow the engine to idle until all that comes out from the radiator hose is coolant. Retighten the hose clamp.
There are only a few ways coolant can get out of the cooling system.
First check where the hoses connect to the radiator to make sure they are completely dry. Then check directly under radiator to make sure it isn't damp. Sometimes the radiator cap will go bad and allow some coolant to leave. You can replace the radiator cap relatively cheap. The very worst way you can be loosing coolant is thru a blown head gasket. The coolant slowly leaks into the cylinder and is burned. You would have to go to a mechanic to have this verified.
Trying to understand from what you wrote..It sounds like something is not recirculating correctly.I would change out the thermostat first because it's the cheapest thing you can do..It might be getting stuck...not opening normal..When you said you turned on the heater and no hot air.. there's a hose right there at the thermostat that runs to your heater core usually under your glove box..If your not getting hot air then the water is not recirculating through your heater core..it could be a valve that is stuck when selecting heat that's not working also.. Flush your radiator..Open the radiator cap only after car motor has cooled down..Drain the radiator...There's a small turn valve nut at the bottom of it..Watch what comes out..is the water rusty color especially as it slows down from draining...They make radiator flush.. Also you can buy a thermostat that opens sooner...Like if yours is 180...you can buy one that opens at 160..A lot of cars are missing the black spoilers under the car that help push air up to keep motor cool..Make sure your water pump is good..Cat converter is not clogged in front of muffler...It will make you car run hot if it's getting clogged...Also Find out where your losing coolant...I've seen on holes in the heater core that leek from where your AC condensed water drips out..It will fool you and loose about a cup of water.. Smell the water your loosing also....if it's dripping from where the AC water is and you smell coolant...You have a bad heating core
Permanent air lock means your system has leak sum were or your reserve tank and radiator cup not function propebly full radiator fit cup Rev engine up to 1500to 2000 few times stop engine and top up sum time take 10 times.
When an engine overheats, the scale and debris that resides in the engine water jackets, comes loose and is carried by the water into the radiator coming to rest in the top tank. This blocks off some of the cooling tubes and causes the engine to run hotter than it should, perhaps even boiling. Have the cooling syatem (engine plus radiator) reverse flushed st the radiator specialists. Have the thermostat checked and corrosion inhibitor added to the water. (or proprietry coolant added).I can give you the procedure for this if you want to do the work yourself.
There seems to be an air pocket or no antifreeze in engine block. Try this method disconnect upper radiator hose and pour water directly into hose down into engine block until it full. when its filled reconnect hose and fill up radiator. as the vehicle warms up open bleeder valve on the thermostat housing and release air from system. open slowly and BE VERY CAREFUL WATER WILL BE HOT, bleed until you get a steady stream opening and cosing valve. However if all of this don't work. You may have a bad pump. Good Luck
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