Is it necessary to warm up an automatic transmission car in place?

[LiamMarie]

It is necessary to warm up an automatic transmission car in place for the following reasons: 1. When parked, the gear oil flows to the lower half of the transmission, and the upper half of the transmission cannot be lubricated when the car is cold; 2. After the car has been parked for a long time, the engine oil flows back into the oil pan at the lower part of the engine; 3. Before the engine reaches its operating temperature, the fuel supply system cannot effectively vaporize gasoline completely due to the lower temperature. The correct method to warm up the car is: 1. Start the vehicle and keep the air conditioning turned off; 2. Warm up the car in place at idle speed for 30 seconds to 1 minute; 3. Begin driving slowly once the engine runs smoothly; 4. Once the engine coolant temperature gauge rises by 1 to 2 bars, you can drive normally and turn on the air conditioning.