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In a knee jerk reaction, drivers hurriedly turn off the A/C when they find that the engine is running hot. In their next move, they park the vehicle and switch off the engine. If you find yourself doing one of these or both, please consider some facts about the cooling system and how it operates.
The thermostat attached to the radiator senses the temperature and operates the cooling fan. It means that the cooling fan will start when the temperature reaches the preset limit and stop only when temperature comes down to normal. By switching off the engine you are switching off the cooling fan too and stopping the cooling process.
When the air conditioner is switched on, the fan starts moving and continues to move irrespective of the temperature. By putting off the A/C you are actually stopping the fan when it is most needed. This is the reason why you shouldn’t put the air conditioner off on engine heating. On the contrary, if the engine temperature rises from the blue to the red area on your thermometer and the cooling fan does not start due to faulty thermostat or a blown fuse, you can turn the A/C on to start the cooling fan.
If you find the engine runs hot only in traffic and runs cool on the highway; it is a clear indication that your thermostat is not functioning. You can get the thermostat and cooling fan examined for repairs.
In the meantime cool the engine by turning your A/C on!
About the Author
Tami Paulus is the Owner of leading Mark’s Old Towne Service, a truck repair and service center located in Anaheim off the 55/91/57 freeways. With experienced ASE certified specialists, we help you keep your fleet safe and running on the road. We realize that fleet managers are very busy, which is why we pride ourselves in thorough fleet maintenance service to ensure you save time, money and unneeded hassles