I just replaced the thermostat on my 81 sd because it was sticking open and running way too cool. It runs a lot hotter with the new t-stat, but I'm not too sure if its too hot or not. Before it never got over 90, even when going up mountains. Now it stays at 100 degrees or a little over pretty much all of the time. Could it be a bad thermostat? Is 100 in normal operating temp.?

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"spreading a trail of obnoxious where ever we go"
1981 300sd w/ 341,500 miles

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