CV joint boot

Depends on the cause. If this was a Ford product, I would recommend bailing out and walking as separated ball joints are much too common. On other brands, light metallic sounds are usually not related to safety systems, but you need to be sure. The best approach is to have the steering and suspension systems inspected at a a tire and alignment shop. The people there are experts at finding the causes of noises, vibrations, and bad tire wear.

You need to add a lot more detail to your description. Does this noise occur when turning left and the car is standing still, or does it have to be moving? If it must be moving, how fast? Noises when turning and standing still are usually caused by a binding upper strut mount, which is typically not a safety hazard unless it makes it difficult to turn, but it can be caused by a ball joint too. If a ball joint separates, there is a good chance you will go sailing into the ditch or into oncoming traffic.

A common cause of a light rattle, like from a tambourine, is deteriorated bushings on the anti-sway bar links. That is not a safety hazard other than it allows the car to lean more when cornering. You will hear this when driving over bumps in the road.

Why did you mention the CV joint boot? At the mileage you listed it is not uncommon to have a worn outer CV joint. Those will make a clicking noise when turning and the car is moving, but most commonly they make that noise when backing up. The rubber boot pushes grease into the steel marbles as it rotates, and it keeps dirt and water out. The marbles, and the grooves they run in are machined very precisely and to very close tolerances. It does not take much wear for them to bind and cause a clicking noise.

If it is the C/V joint making the noise as you suspect and it sounds like it is, I would not keep driving it as the axle will eventually come apart and you will not be able to move and possibly do further damage.
Hi Doc!

Hi brother Wrenchtech. The left outer joint on my '88 Grand Caravan made noise for two years. I did have to replace the boot once, but I figured it didn't pay the second time since it had started making that clicking noise already. As luck would have it, the last of the six marbles fell out right where I park in my driveway with it turned sharp right. I drove in fine the night before with no noise or vibration, parked, and it never moved an inch the next day. Found that one remaining marble under the van. Thank goodness I didn't have to walk home. The observation that should have gotten my attention was the clicking noise had stopped occurring for the previous week or so. The stopping of the noise indicates some important part fell off!

I've also listened to stories where a CV joint broke when there was no warning noise. The owners did not know what the conditions of the boots had been. My point is while I got lucky, replacing a half shaft is less expensive than replacing just the outer joint, and it's not a real expensive job. I'd get 'er done before you're sitting on the side of the road in a pile of tears and have to decide which way is shorter to walk.