The water pump will pump coolant(antifreeze & water) through the engine after the thermostat opens up.
heater core....
Are you sure the thermostat is installed correctly, or is it low on antifreeze? I would check the antifreeze level first.
Probably a gasket leak. Could be the intake gaskets or the thermostat gasket.
Replace the thermostat gasket.
To change the thermostat on a 1997 Plymouth Breeze 2.0, a bucket should be placed under the vehicle where the hose for the thermostat is. This will catch any leaking antifreeze. Remove the hose clamp from the top radiator hose where it connects to the engine. Note how the thermostat is positioned in the hose. Remove the old thermostat and replace with a new one. Tighten the hose clamp after reconnecting it to the motor. Check antifreeze level and refill if necessary.
I would say you have a bad water pump, thermostat or a bad hose depending on where the antifreeze is spraying from. If the antifreeze is coming from the timing cover area you have a bad pump, if it is coming from the front area of the motor I would say bad hose, if you are hearing a gurgling sound from the radiater I would say bad thermostat.
find where the upper radiator hose goes to the engine block. The thermostat is located below the housing. You will need to drain part of the antifreeze then remove the housing the thermostat can be popped out with a screw driver. be sure to clean the old seal completely before reassembly
Failed seal. Replace it.
changing thermostat on L300
If it is coming from the radiator or the hoses this would mean your antifreeze is boiling in the lines. I would recommend first changing the thermostat and bleeding the air from the rad lines.
An antifreeze leak.An antifreeze leak.
changing the thermostat in a 1991 geo metro 1.3 liter