What does it mean if the refrigerator is leaking black fluid

not sure what your saying about back bottom but sounds like your washer transmission is leaking possibly? see pics if you look at transmission you will notice a tiny black like rubber pc. like a weep hole used a a fluid fill port and it may be leaking from there sorry could not find the right pic of it under the clutch assembly

Assuming you are referring to a vehicle and not household plumbing, what kind of leak are you talking about? Engine oil? Cooling system? Air conditioning refrigerant? Brake fluid? Transmission fluid? Gasoline or diesel fuel? Differential fluid? Windshield washer fluid? Battery fluid? Or perhaps a water leak into the inside when it rains?

1st your sure your not looking at the motor oil instead (that color is not good on motor oil either) , but if your sure your looking at the transmission fluid then id say that trans has problems ! a fluid /filter change is the place to start , but if that's no good and trans still doesn't work well then a rebuild is the best way to eliminate any problems

The red fluid is called Glycol, it is not refrigerant. In water coolers
the refrigeration system cools the glycol which in turn cools the water. If you can locate the source of the leak and repair it, simply top up the glycol with water to its proper level.

the fluid you are seeing if its coming from where you say.Is fluid from the deferential axle meaning a seal is leaking or it also could be a brake fluid leak from the wheel cylinder.none of this will keep your truck from moving unless your fluid is coming from the transmission,that will keep it from moving if its low assuming you drive an automatic.

Black means your gas flow washes away oil. Now where thst comes from cant tell you from 5000 miles away. But check out your oil level and signs for leaks around the carb and cilinder heads. Another practical but time spending work is to empty your radiator fluid and see the colour of it. if dark and "soapy"means you got a leak somewhere inside. Gasket? Worn pressure cilinder head springs? Can't tell for sure.

Blowing air just means the fan is working.
No cold air is usually just low refrigerant
but it could be a bad compressor as well.
Have the refrigerant level checked first.

your freezer cabinet need to get all out also the ice machine,and open the back wall
there is a drain hole in the bottom middle of it make sure it is clean, and if you pure water they go all the way
through the pip to the drain pan next to the compressor.
good luck 911servicetoday .com good luck

There is no blue fluid in a refrigerator.
Something external or a add on is causing the blue fluid.

Without knowing a bit more about the black fluid it is hard to guess where it could come from - in a fridge there should be no black fluid and the only oils are mixed in with the refrigerant so the fridge will not be working if any noticeable amount is leaking out, as the gas will leak out as well. As you mentioned, the most likely liquid is water from inside the fridge or condensation from inside or outside that has bacteria growing causing the blackness. this sort of water may usually only be in the water tray at the back but there are many possibilities of it leaking out somewhere else - only way to check is to get the fridge running, up on four chairs or a VERY strong glass table so you can see where it is comning from. Another possibility is that there is some insect, plant or rodent factor - the moist warm space under a fridge is quite popular and they can produce their own liquids and also especially rodents cause unpredictable holes and damage all over the place. also can only be checked by looking very closely at the source of the liquid. The last possible cause i can think of is some sort of corrosion - i have not heard of this type of corrosion with a fridge, but it is quite common on steel ships - salty humidity and chemicals (cleaners/cargo etc) reacting strangely with the paint or steel are normally blamed - just think if you get too many strong cleaning products near the bottom of the fridge and look for general condition of the paint/metal underneath you should be able to see it easily if the black fluid was in any significant quantity - there would usually be a sort of rusty look to the fluid, but not always depending on the combination of chemicals present. Where you describe the fluid coming from, sounds like it could be from the door insulation - maybe leaking through the bottom hinge holes - check that nothing is leaking into the door from inside, although condensation can easily happen in the door body itself if the insulation has separated slightly from the "skin" of the door inside. Last thing to try is to investigate the fluid itself a bit more closely - get some on a piece of kitchen paper towel or a coffee filter and then wet the paper with water also just next to the fluid- the parts of the liquid should separate out a little as the water soaks through the paper and you may just see something that looks familiar. If you get no luck post back and try to describe exactly what the fluid does smell like, without trying to imagine smells like "oil" which means nothing as they are all different and in particular fridge lubricants are relatively odourless. think of things you actually know the smell of and try and describe it in those terms - if you feel brave then it may be worth tasting the liquid - just taste a tiny tiny bit on a cotton bud/Q-tip dabbed on a few different areas of your tongue and then wash your mouth out with mouthwash straight after instead of spitting or swallowing - I know it sounds dangerous and disgusting but it is the way that many professionals identify unknown substances as taste has a much more specific "database" in the brain than smell has. just be sensible. Hope this helps - post back if not - photographs may help if you have a digital camera, especially of the coffee filter test if you get round to it :) Good luck