I have a 95 gt 5.0 and when I sit with ac on car runs cool but when driving it goes to about half way up on temp gauge. Its alittle backwards I would think it would get hotter when sitting and cool down when moing . I have noe leaks or bad gaskets and new thermastat so Im stumped. I also have flushed system so Please help!!!! Also when ac off car stays cool when driving or sitting.
Mine runs any where from 190 to 205 I have an after market gauge now but when I had the stock gauge it was normal for it to run a little higher than half way up . I don't have ac cause it was deleted , but I know for sure that when the ac is on the fan runs all the time so it will keep the engine temp down a bit. as long as your not out of the normal range on the gauge I wouldn't worry about it.
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