Stuck thermostat or defective water pump.
Most likely this is the result of a stuck thermostat.
put coolant into my over flow car was running hot and the coolant erupted like a volcano on the side of the over flow
If a Subaru Forester lacks coolant flow, first check for any visible leaks in the cooling system, including hoses and the radiator. Ensure the coolant level is adequate and that the thermostat is functioning properly, as a stuck thermostat can impede flow. If these components are in good condition, consider inspecting the water pump for proper operation, as a failure here can also disrupt coolant circulation. If necessary, consult a mechanic for a thorough diagnosis and repair.
Check your antifreeze/coolant level in your radiator. If it is "low", there will not be enough coolant to "flow" through the heater core, to produce any heat. If it is low, refill your system with the proper mixture of coolant and also check for any coolant leaks.
Coolant overflowing from a 2003 Cavalier overflow tube usually indicates a blown head gasket. Check the cylinders for proper compression to confirm a blown gasket.
In a 2004 Chevy Malibu with a 2.2L engine, the coolant flow starts from the engine block, where it absorbs heat. The heated coolant then moves to the radiator through the upper radiator hose, where it releases heat to the air. Once cooled, the coolant returns to the engine via the lower radiator hose to continue the cycle, aided by the water pump, which ensures proper circulation throughout the cooling system. The thermostat regulates this flow by opening and closing based on the engine's temperature.
over heating ,bad radiator cap or blown head gasket
If the coolant in a 1993 4Runner is overflowing but not getting hot, it could indicate a few issues. One possibility is a faulty thermostat that is stuck closed, preventing proper coolant circulation and causing the overflow due to pressure buildup. Another reason could be a leak or air pocket in the cooling system, which disrupts normal flow and leads to localized boiling without raising the overall temperature. Additionally, a malfunctioning water pump may fail to circulate coolant effectively, leading to similar symptoms.
The presence of the valves usually restrict the coolant flow into the heater core.
Heat will flow from the coolant to the air The coolant will absorb the heat from the building.
It might be clogged, thus not allowing enough flow It means that the excess coolant is going where it is supposed to. The coolant expands when hot and goes to the over flow reservoir.
What?! Until full! Start the vhicle, run for 10 inutes to enable the thermostat to open and the coolant to flow. Add the proper mix of coolant to fill the radiator to the bottom of the neck. The system will be sufficienty full