I had the same problem, taking the thermostat out helped for a bit, but keep an eye on it it could be a sign that the waterpump is going out. shortly after i took the thermostat out my waterpump failed.
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The thermostat is located under the engine Follow the lower hose from where it attaches to the engine. Be careful with the bolts, use
penetrating oil, you do not want to break one. Try to use a Subaru
thermostat and gasket-- expensive, but cheaper than an overheated
engine, most places do not stock the required thermostat, being an
oddball temperatiue (167F), putting in a "regular 195F" thermostat WILL
cook your engine. The gasket is really an O-ring affair-- it works
nicely. Try not to re-use the old O ring gasket.
When a car overheats it's rarely the thermostat. They just don't go bad that often. If it overheats when you idle a lot, it's the fan and with electric fans, it's almost always the fan motor. But to find the thermostat, follow the top radiator hose to the engine and there it is.
subaru provided a access port in the truck of the vehicle where a round plate can be removed to access unit. tank removal not neccessary. recomend replacing with factory oem part from dealer for best results.
I hate to tell you this but the guy isn't returning your calls because the head gasket is blown and he probably knew it. As for the 1990... have you checked the water pump for leaks? (front/ driver's side on the bottom of the engine) My guess is that it's faulty and unfortunately, it's behind the timing belt. Both of these repairs will be a pretty penny. Good luck!
Multiple causes for overheating. Start with thermostat.
I had an overheating problem in my Subaru that ended up being a head gasket (I replaced thermostat and radiator, but these did not help). It turned out that the head gasekt leak was allowing air into water passages that prevented water circulation in the engine.