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Message: <blockquote data-quote="Kyle Keller" data-source="post: 979772" data-attributes="member: 64319"><p>I've had to add coolant a few times over the past few weeks. I'm not one to neglect a car just haven't had time till now to look at the situation. Basically the coolant from the reservoir is not cycling through. How do I know this? Because I added a slightly different color from a radiator leak preventive to the expansion tank and after 30 minutes/30 miles it was still the exact same color at the exact same spot in the expansion reservoir. The car stayed between 198-200 at most of the time but it did get as hot at 207. My question is....If it is the thermostat stuck or not operating correctly, after 30minutes/30 miles of driving, surely the temperature would have gone way over 200. Maybe 217 like you mentioned. But it hasn't. This is what is baffling me. If the coolant isn't cycling through from the expansion tank but the engine is not overheating what could be the cause?</p></blockquote><p></p>