See if the engine turns over by putting a socket and ratchet on front bolt that hold the pully on. May have to have starter motor checked out if the motor turns freely.
SOURCE: Overheating 93 Subaru Legacy
water pump could be bad again. if the seal is out lets air in around pump propeller and it won't move water and it over heats. its a lot of work but you can fix it your self
SOURCE: 1997 subaru outback legacy overheating
I've had the same problem all year. I've had four different mechanics look at this car - 97 legacy with 2.5. I've had the coolant seals replaced, the radiator cap, the thermostat, the water pump - all to no avail. I've realized now that it only overheats shortly after running sustained high rpm's. Recently the last mechanic mentioned the bleeder valve (I didn't know it had one and think maybe he didn't know either - not a subaru mechanic). Recently it overheated again (again sustained high rpm's - apparently more prone to produce air in the system), I sat the vehicle on an incline (raising the bleeder valve to be the highest point) and let the car warm up and run for half an hour. Now 300 miles and no overheat. I went through alot with this car to get to this point. Unbelievable.
SOURCE: 93" subaru legacy ( EJ22 with auto) engine stopped & won't start
Water introduced through the fuel system. Drain tank and lines, refill, and add HEET.
SOURCE: overheating
The 97-99 2.5L DOHC Subaru engines were notorious for this problem, blown head gasket is very likely the cause. It is possible to test for the presence of exhaust gas in the coolant to verify. The reason the car seems to be overheating then cools down quickly when shut off is that the hot exhaust gas displaces the coolant at the top of the engine where the sensor is. If it happens consistently you will need to deal with it, I have worked on an engine that was run many miles under this condition and it damaged the block beyond repair. If you are a decent shade-tree mechanic, it is possible to do the work with the engine still in the car, you will have to raise it up an inch or two to get sufficient access. I have personally done 3 engines with this problem, a 98 and 2 99's.
SOURCE: will 1999 subaru engine fit in 1997 subaru legacy?
Yes as long as the Motors are the same. You might need to have the computer out of doner car. Doors are suppose to fit 96 to 99.
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