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You have to tap into the heater hoses.
Most vehicles have a coolant reservoir (a clear plastic tub) with a phrase "engine coolant only" printed on the cap. This is where you should add engine coolant.
The radiator cap when bad will allow pressure to go back to the overflow bottle, after that check your thermostat. The coolant system should be pressurized when warm, so much so that the hoses feel hard when squeezed. The radiator cap is made to release the pressure when it becomes too great, if your cap is worn out the pressure will release too early and pressure will blow out to the coolant bottle.
The Two Small Hoses That Comes Off your Water pump Go To Your Heater Core The Hoses Are About 3/4"
This fluid can leak from many places. Look in places where water hoses meet the engine, where the heater hoses go into the firewall, the radiator and your heater core.
air trapped in your coolant system. take the radiator or coolant recovery tank cap off if you don't have a radiator cap. Take it off when the engine is cold. Start and run the engine at idle with the cap off. Keep adding coolant if you see the level go down. Continue to do this until no longer see any drop in the fluid level. If your fluid does not move, then your water pump is the culprit and not moving the coolant out of the engine.
to the coolant recovery tank if so equipped - if no coolant recovery tank then not connected to anything - just an overflow
You might have air in the coolant system from a recent part {Hose, thermostat,etc} change. It will push the fluid through the hoses where ever it can go...
Low coolant? Cooling fan not working? Radiator restricted or plugged? Water pump not circulating coolant? Defective radiator cap? Low coolant? Cooling fan not working? Radiator restricted or plugged? Water pump not circulating coolant? Defective radiator cap?
It is worn and needs to be replaced. It is collapsing when the water pump draws coolant.
Just follow coolant hoses from rear of engine to where they go through the firewall.
The radiator cap is under the gas tank at the front. There is also a coolant recovery tank located under the passenger seat on the left side.