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This is either a cooling system fault which could be, thermostat, radiator or fan thermo switch, check that both top and bottom hoses are hot, if one is cold the thermostat isn't opening, check to make sure the radiator fans are turning on. If the thermostat is opening and the fans are turning on you need to take the car to get the cooling system pressure tested as you may have a leaking head gasket.
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You may have a coolant leak in the system. You need to pressurize the cooling system and look for the leak. If no leak is found, then the thermostat may be stuck closed causing the car to get hot and boil out the coolant.
Looks like you have a leaking head gasket or cracked head. You can buy a head gasket leak detector kit that will let you know if there is CO2 gas escaping through the radiator. I think that it is this gas leak that makes it look like your radiator is boiling.
thermostat sticking. pressure cap (radiator cap) to low release pressure. Pressure work like this water boil at 212F each pound of pressure cap = 3 degrees F . then a 15 psi cap is 15 x 3 = 45F so it means that water coolant will boil at 212F +45F + antifreeze boiling point.
you have a blown head gasket.. doesn't have to have coolant in the oil for a blown head gasket... if hoses are rock hard when running then you have exhaust leaking into the coolant via a blown head gasket...
did you let excess air out of radiator? after filling let it run for a few minutes with out radiator cap and make sure the water does not go down and serculates after thermostat opens, refill if needed
do you notice moister under vehicle in the morning ? possibly a gasket could be leaking.
you need half antifreeze and half water. to raise boiling point to keep engine from over heating.if you run just water it is evaporating away .that why it seem you got a leak.
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