Check the belts. The most common cause of squealing is a worn or loose belt on the front of the engine.
Engine running hotter then 220 degrees can cause valvetrain noise. Bad fuel can also cause valve noise / PINGING sound. Ignition timing to high / Advanced to far, can also cause engine noise.
A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.
The cause of the whining noise in the front end of a 2004 supercharged Monte Carlo, especially during cold weather, is the idler pulley. This is located at the driver's side of the engine between the alternator and a/c pump.
cold engine
No
A bad compressor belt can cause a whistling noise while running the air conditioner. A bad engine can also cause this noise.
Wheel bearings will cause a rumbling noise consistent with the revolution of the tires. Your highlander is doing a computerized check of systems. If your noise is like mine, when you start the engine and pull away you hear this noise and then it goes away.
Get Some WD40 on the front axle and the back one or check the engine!:P
replace hub or wheel bearings.
Perhaps a bug on windshield.
Probably