You may be surprÂ­ised to discover that a carbon monoxide (CO) detector really isn't a complicated piece of equipment. Housed inside a plastic chamber approximately 3 inches (7.6 centimeters) in diameter are parts that work in unison to alert a househoÂ­ld when lethal gas is detected.
This type of noise is usually caused by malfunctioning valve lifters or an exhaust manifold leak. If the noise lasts for more than a minute and completely disappears or dimishes after the engine is warm, the most likely cause is an exhaust manifold leak.
Causes of an Air Conditionerâs Buzzing Noise. If your air conditioner is making a buzzing noise that is loud enough to become a distraction in your home, chances are that something is wrong with your unit. When you hear a buzzing noise from your AC, you could be experiencing one of the following issues: 1  Malfunctioning compressorâ The compressor in your air conditioning unit is the part of your cooling system that works to pressurize and cool the refrigerant in the unit.