Is It Normal for the Car Key to Be Hot When Pulled Out?

1 Answers
JasonLee
07/25/25 12:09pm
It is normal for the car key to be hot when pulled out. Here are the specific reasons why a car key may become hot: 1. Sun Exposure: The heat of the car key is directly proportional to sun exposure. The car ignition lock is made of metal, and the hotter the sun, the more heat it absorbs. The temperature inside a closed car under direct sunlight can exceed 80 degrees Celsius. The thin car key inserted into the ignition lock can quickly heat up, causing the key to become hot. 2. Excessive Current Passing Through the Ignition Switch: If the current exceeds the maximum safe current of the static and moving contacts, the entire ignition switch will heat up, warming the car key. Over time, as the contacts wear, the temperature may continue to rise.
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