Anyone who has ever owned a hamster knows they're not silent pets.

Most people describe it as a whistling noise that occurs alongside their rat’s breathing. A loud, high pitched squeak is a negative response to something. Wheezing is a common sound you might hear if your rat has the start of an upper respiratory infection or is experiencing a mycoplasma attack. Add one quart of water to the bottom of the tub and the noise should go away.
Squealing or Rattling Pump Noise: If the dishwasher is new, it may not have any water in it. The sound of a scream coming from your hamsters cage can be very alarming, and … Other than that she is perfectly healthy and moving around and eating normally.

This is a sign that your gerbil enjoys being touched by you and is in a good mood. The clicking is buildup of fluid in their lungs but I'm not saying that this is for sure what is going on with your Gerbils. Hamsters are capable of making a wide assortment of surprising noises, including squeaks, squeals and screams.

The sound may also occur if the dishwasher is run after an extended period of time without any use.

If wheezing is the result of mycoplasma, it should go away on its own within 48 hours. Your gerbil may also make a purring noise, similar to a cat, when you pet it or stroke it. Notice if your gerbil purrs happily when you hold it. The fur is probably ‘staring’ – this means unkempt and clumping and when you are close to the gerbil there will be a clicking sound as it breathes. Your gerbil's purring may also cause it to vibrate. A lot of quiet squeaks mean the gerbil is excited. Most of the time it is just his front paws that are shaking and he's also making a clicking noise like his teeth are chattering. This is because its lungs will be very moist and the click happens when the airway briefly clears with each breath.

I have also heard gerbils grinding their teeth when they nervous, are scent marking or are agitated at another gerbil.
For example, it could mean that the gerbil is in pain or frightened. Pet Specialist: Anna , Pet Expert/Biologist replied 11 years ago If his teeth are chattering, it could be that he's cold or in pain.

But just now I have noticed Jet, my lone black gerbil is making a clicking noise, which is especially noticeable when I'm holding her and shes moving around in my hands.

Gerbils also chatter- put him right to your ear and you will hear this. This can cause a "squeal" or "rattling" sound the first time it is used. She is just her usual crazy, energetic self really.