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Freon in the AC system heats up very hot before it is sent through the condenser. The condenser is like a radiator, and is located right in front of the radiator of your car. As air passes through the condenser & the radiator , the hotter the condenser, the hotter the radiator will be. correct answer the temp goes up when using a/c as the motor is running at a higher speed to drive th a/c , therefore when idling the fan is not pulling anuff air over engine. a thrmatic fan will help with this

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โˆ™ 2007-01-24 18:52:41
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Q: Why does temp gauge go up when car is sitting with ac on but doesnt go up when ac is off?
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