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Overheating is NEVER normal no matter what the ambient temperature is. The thermostat, coolant temp sensor and fans are in place to control temperature in a NORMAL operating range. If the temp gauge goes into the red then something is wrong. Even a faulty radiator cap can cause cooling problems if the spring within it becomes weak and cannot prevent antifreeze from releasing into the overflow tank. That would be the first thing I would change since it's inexpensive. Point blank, the dealership is full of sh!t.
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