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Re: Finally picked up my 96 SVX. Temp gauge moves around a little.
My '92 pearl had (a) blown HGs when I bought it-- temp gauge would yo-yo as you've described. If I recall correctly, the other symptoms I had were bubbling in the coolant overflow tank after I turned off the car, and a lot of black gunk in the coolant tank as well. The temp gauge would yo-yo gradually at first, and as the car got hotter, it would get more extreme, shooting up into the red before coming down when the fans kicked on (A/C relay would kick off as well.)
After I replaced the head gaskets, the temp needle was rock-solid about 45% of the way up, regardless of terrain.
I hope for your sake it's the rad cap or the thermostat.
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