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The air conditioner will create extra heat. So if it's really hot to begin with turning on the AC will only make it harder on your cars cooling system. If you haven't had your coolant flushed/thermostat changed in a long time you might want to try that. Also make sure there are no obstructions in front of the radiator.

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Q: Why does the temperature gauge go in the hot range only in the hottest part of summertime when the air conditioner is on The check gauge light goes off when the air conditioner is turned off?
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