remove the lower coolant hose and drain it into a catch pan
Overheating Low coolant Defective radiator cap Stuck thermostat
Bad head gasket? Bad thermostat? Defective radiator cap?
You could have a bad water pump causing no coolant flow, inoperable radiator fans, a coolant leak,............
According to Advanced Auto Parts the Thermostat is located on the lower radiator hose at the engine. Thanks, Kit
Low coolant, failed thermostat, failed water pump, radiator restriction, etc.
The overflow bottle may overflow if: 1. The car is overheating - this means after the coolant in the radiator gets heated up and expands it flows to the reserve bottle but the radiator doesn't cool down to suck back the coolant from the overflow bottle, but just keeps on sending coolant to the bottle. 2. You may have put excess coolant in the bottle - hence heated coolant from the radiator didn't get enough space.
If your 1997 Subaru Legacy is the same as My RS-B Twin Turbo?, the Radiator and Overflow bottle have to come out and the Thermostat is at the front of the Engine, down the bottom-just to the right of centre, (Thermostat is inside the bottom radiator hose), - My Thermostat just twisted/pulled out, let all old coolant flush out-put New Thermostat in its place, Radiator and Overflow bottle were put back in and radiator topped up with fresh coolant and water, Overflow was filled to second line as it should be, car was started with heater on full for 5 minutes to disperse any air in water - (note) after adding fresh coolant, add water in Radiator till it can't take anymore-to show its filled properly.
no antifreese
yes
Coolant is added to the overflow bottle instead of the radiator. The overflow bottle will allow fluid to fill over into the radiator.
on the intake manifold, close to the thermostat housing, which is at the end of the top radiator hose on the engine.
An overflow tank is a bottle that holds coolant that expands and leaves the radiator under driving conditions. The Coolant will go back into the radiator as needed.