Why does the car heat up slowly when the heater is turned on?

The problem with the water pump is that the water flow is small. After refueling, the water flow increases and it becomes warm.

The idling warm air is not hot, but it is hot when refueling. The idling antifreeze does not circulate and refueling circulates. This fault is that the vehicle's cooling water system has insufficient liquid level. Insufficient cooling water will lead to poor circulation, and the gas pedal will Circulation, the circulation will be weak without accelerating the throttle. This is because there is air resistance when the cooling water is first added and it will not be filled all at once. Just wait until the car is cold and then add the cooling water. The specific operation steps are as follows:

1. Open the door on the cab side. ?

2. Pull the hood switch on the left side of the driver's leg. ?

3. Lift the engine hood upward. ?

4. Use support rods to support the hood to ensure firm support to avoid danger. ?

5. Open the cooling water tank cover and add cooling water. ?

Notes:

1. The same type of cooling water needs to be added.

2. When opening the water tank cover, you need to take cover to avoid splash and burns.