legacycentral bbs

My 93 wagon has started to overheat while driving at slower speeds. When it is on the freeway going 60+ the temp stays just below the middle, but when I slow down the temp needle starts to creep up. When this happened, I pulled over to let it cool down and check the coolant reservoir to find it all the way up to the brim, but after 2 min or so it goes back down to the normal level. This only really happens after freeway drives though. There isn't an oily sheen on top of the coolant so I don't think it is the head gaskets and both fans are working normally, anyone have an idea on whats happening? Any info would be much appreciated.

You say the fans are working properly? That would be the first thing i would look at because at highway spped its being more air cooled then at lower speeds. Is this a manual or and auto? Possibly a sticky thermostat not fully opening? Any major work done to engine?

Other than the radiator I replaced about 10k miles ago, no major work I know of has been done to the engine/cooling system. The car is an auto. I haven't considered the thermostat though ill look into that.

So I made the trip to the dealership to get a subaru oem thermostat and gasket, installed that and flushed and burped the air bubbles out of the cooling system. Tried as hard as I could to overheat the engine and thankfully, was unsuccessful! Guess that fixed it thanks a ton for the tip

Hell yeah! Glad to hear it worked out for ya

Yeah, it sounds like you had air bubbles and/or a non-Subaru t-stat.