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If the temp sensor is measuring outside air, It could be exposed to the air moving over the vehicle which moving air feels cooler than still air, If any one lives in Orlando, FL can tell you. hello.there. there is no way that the temp sensor could read the outside air. your temp sensor goes down when you drive because air is streaming through your cars grille a lot faster than when you are sitting still or parked. that is the way they are design to work and this is a fact.

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12y ago
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Q: What causes the temperature gauge to go down while driving?
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