Humming noise

[Ben123]

Folks,

I need some advice here. Noticed lately my car has a humming noise when driving. Noise increases as speed increases and is loudest at 80 km/hr. Beyond 80km/h, the noise reduces again. Not sure if it is resonance at work or due to tire contact. Mine is a 3 yr old Daewoo Lanos. Does anyone have such a problem before?

 

We all know one way to save on fuel is to minimize the use of air-con. With the compressor running, does it make any difference if I increase the fan speed? How abt adjusting the temperature knob? Is there any fuel consumption (does the compressor cut in and out?) if I set the temp at the coldest versus setting at mid-range.

 

Thanks

[Luckcent]

The humming noise you are experiencing maybe due to the wheel bearings. When did you last change the tyres ? For airconditioning, setting the fan speed will not affect the FC but if you set the temp. to higher and the compressor cut off earlier will result in less fuel consumed.