97 Subaru Legacy Overheating Problems. Subaru cars & trucks replace head gasket legacy dont truck heater blow heat view all ». The most common reasons a subaru legacy is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat.
I had a problem with a 1998 subaru legacy a few years ago. One of two things is happening. If this light does come on, make sure that you get off the road quickly and safely.