Nasty kid next door tied his skateboard under there? Maybe tied his little brother? Loose suspension components, loose drive train parts, esp CV and universal joints, dangling muffler, dangling spare tire....
Is it a loud thump like something has hit under the car?
If it is a continuous thump (ie thump, thump, thump) that changes in speed with the speed of the vehicle it is likely related to a tire problem. If it happens when you hit a bump or immediately afterwards it is likely due to something loose or worn out in the suspension. If it happens somewhat randomly and doesn't seem affected by bumps it may be a loose piece of trim, or something loose under the car getting knocked around by the winds.
There might be a squeaking noise when driving slow in your 2000 Beetle because your suspension needs to be replaced. The squeaking can also come from the universal joint.
Defective left front wheel bearing. Have this repaired ASAP, as it can cause an accident.
cv joints
The knocking noise could be one of several things. The wheel bearing, a worn steering or suspension part, or road debris could be causing the noise.
The air conditioners intake it under the passenger side dash all the way in the front. Some times receipts or plastic bags can get sucked up there and cause the noise. -Gary
Driving under the influence.
A high-pitched squeaking noise while driving, unrelated to the brakes, could be caused by several factors. Common culprits include worn or loose belts, such as the serpentine belt, which can produce a squeak when under tension. Additionally, issues with wheel bearings, suspension components, or even tire noise can contribute to such sounds. It's advisable to have a mechanic inspect your vehicle to pinpoint the exact cause.
ck the struts
One thing that can cause a clicking noise under the car is when the bar bushings get worn out on the sway bar. Also, it could be coming from the struts if strut oil is leaking. Other things that can cause a clicking noise if not working properly are the exhaust system and the transmission clutch assembly.
back struts are bad or exhaust is loose