What Causes Slow Engine Temperature Rise?

1 Answers
DeAmara
07/29/25 12:39pm
Slow engine temperature rise may be caused by a faulty temperature sensor. Related explanations are as follows: 1. During winter, slow temperature rise could be due to a stuck thermostat. A stuck thermostat can cause the engine to operate in an abnormal cycle, preventing rapid temperature increase. If the thermostat has been replaced before, the new thermostat might have a lower opening temperature, initiating the large circulation before the temperature rises sufficiently, which affects the warming process. 2. It could also be that the thermostat is continuously in large circulation mode, resulting in slower temperature rise. The performance of the thermostat also affects the speed of temperature increase. In a cold engine state, the small circulation through the heater core should take priority, and the large circulation should only open after the temperature has risen.
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