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Why does the Buick ambient temperature always display -40 degrees?

1 Answers

FinleyRose

07/30/25 10:34am

When the Buick's ambient temperature consistently displays -40 degrees, it indicates a malfunction in the outdoor temperature sensor, which needs to be replaced promptly. Function and principle of the ambient temperature sensor: Its role is to monitor the ambient temperature and control the operation of the air conditioning system. The working principle involves a bimetallic strip inside the sensor, which has different thermal expansion coefficients. This allows the strip to deform when reaching a certain critical temperature range, causing the contacts to connect and complete the electrical circuit. Method for replacing the ambient temperature sensor: Before replacement, first disconnect the negative terminal of the battery. Locate the sensor in front of the radiator, replace it with a new one, and then reconnect the battery.

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