Hello.... I am very new to this forum, and so far I have learned alot. I noticed today while drivng my (new to me) 97 3500 on the interstate for the first time, that my temp seems to go from about 140 to 190, then rapidly falls back until it hits 190 again. It does this very often. Is this normal, or do I get to buy another part??? In a stretch of 5 miles, it may do this 4 or 5 times.
