Even though I'm not a pro at this.......I did have a similar problem with my 90 legacy.....The temp. needle acted funny like yours does and mine started to be consistent, but to the point of me only being able to drive the car for about 5 minutes before reaching red zone in the temp gage.......It turned out to be head gasket....I didn't see smoke but, everynow and then the coolant would microscopically hit the exhaust.....I never saw any coolant on the ground though.......But the good folks at Subaru fixed it for 1000.......No problems now though......
But also check to see if your thermostadt is bad or.......maybe this is a remote possibility......Are your electric fans kicking on or cutting out?......Kinda hard to know that when you are driving though........
I'm curious to know the answer too!
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Matt
1995 Subaru Svx L / AWD
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