Q: Car says it overheated, but no steam comes out. The temp goes up and down on the monitor fan is working

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My car monitor says it’s overheating, no steam comes out and the temp will read 245 degrees and 1 minute later it says 200 degrees, even faster if I turn on the heat. The fans are coming on, ive looked at them while parked. I sometimes smell a syrup smell, I assume that is the coolant. The first time this happened, I checked the coolant level and it was a little low so I added some, but it’s still doing the same thing. The coolant is still full from the first time I added it.

My car has 75000 miles.
My car has an automatic transmission.

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