What is the situation when the car makes noise under the car when idling? Why does the car make noise under the car when the air conditioner is turned on?

Many car owners will encounter this situation when driving. When the vehicle is idling or at low speed, they feel a buzzing noise under the car and a slight resonance under their feet. If the car accelerates, this feeling disappears. What is going on? Let's take a look!

What is the situation when the car makes noise under the car when idling?

The oil pan guard plate installed in the modified car will cause vibration at a certain speed of the car. In some cases, improper operation during operation will cause the oil pan guard plate to deform, thus interfering with the car chassis, which will also cause the above phenomenon. The above fault phenomenon can be solved by installing a buffer block.

For some drivers, the soft connection part of the exhaust pipe falls off during operation, which may cause abnormal interference and need to be reinstalled.

Why is there noise under the car when the air conditioner is on?

Check whether the surface of the radiator water tank or condenser is too dirty. If the surface of the radiator is covered with a thick layer of dust, the heat dissipation effect will be poor and the frequency of high-speed operation of the cooling fan will increase.

When idling or speeding, such as when the air conditioner is turned on or the engine coolant temperature is high, you can also hear the fan running at high speed periodically. This is normal.

How to Check for Engine Vibration Problems

The engine is fixed to the frame by 4 reaction claws, one each at the front, back, left and right. Generally, the resonance when the engine is idling or at low speed is caused by the rubber of the engine claws hardening due to time problems, so the vibration of the engine is transferred to the body. You can manually detect it yourself. There is a reaction claw on the left side of the engine compartment. You can also lift the engine a little. If the body vibration is significantly reduced or disappears, please replace the engine claws, and try to replace four at a time.

Why does the noise of a car get louder as it ages?

For some older cars, the connection between the engine and the body, aging, rubber or hydraulic failure, can also cause serious noise. In a very small part, the fuel pipe is not properly adjusted, interfering with the body and causing resonance.