Hello everyone,
I have a 96 Legacy Outback 2.5 with 236,000 miles. After overheating issues due to the second HG failure I just finished the EJ22 swap. Everything went great using the advice from many on this forum. Thanks to all. Before figuring out the HG problem I replaced the water pump, thermostat, radiator (old one burst) and all hoses. None of these components has more than 5 miles on them. After firing up the new EJ22 (120,000 miles) everything seemed great. I drove the car around the block a few times and everything checked out. A few days later after buttoning up misc things I drove to the gas station and back, about 3.5 miles roundtrip. Again everything was fine. I left for work the same evening and drove about 2 miles. The check engine light came on and the temp almost hit the H mark. I pulled over and popped the hood. No coolant leak, fans not on. I waited about 10 min and fired her up. The temp was back to normal. ?? I headed for home. As soon as I began decelerating to stop the temp started climbing. The second I took off the temp quickly dropped to normal. This continued until I returned home.
Here is a list of what I have determined:
I can let the car idle with the AC on or off for 20 min and the temp is fine.
The fans are working.
Upper hose is hot.
Lower hose is cold.
Heater blows cold.
Heater hoses luke warm
Radiator feels cold.
Bypass hose is hot.
I removed thermostat (Subaru) and checked in 190 deg water
alongside a carquest thermostat for comparison. Both opened.
I looked in the water pump and the impeller is not broken.
Using a long screwdriver I was able to turn the impeller. The resistance felt matched what I think it would take to turn the smooth WP pulley.
I don't know what to do next. Any help would be greatly appreciated.
Thanks, Patrick Rauch