Our Sanyo bar fridge is not cold enough despite turning up the dial. Milk has curdled within days because it is just nor cold enough. Is this a fixable problem and what does this indicate, poor freon? Is our bar fridge on the blitz? It also accumulates frost in the upper right hand corner of the fridge. Can it be fixed? Melody

You just need to keep adjusting until you find what works on the dial for you. The liquids should be cold to the touch, and it should NOT freeze any of the produce or eggs...if it's too cold, turn the refrigeration down, ...if the milk is spoiling too soon and the cheese is going bad, turn it a little colder. It takes a while to learn what works, but once you find out, just leave it alone.

What's Milk Got?
The main nutrients of milk are lactose, (the milk sugar some people are intolerant of), proteins of various sorts, and butterfat, all sloshing around in about 85 to 90% water. It total, milk has about 100,000 different compounds in it, and you could probably find a microbe that likes every one.
Soxhletization?
In the old days, if you got milk, you could also get Typhoid and Scarlet fever, Diphtheria, Tuberculosis or various diarrheal diseases. Mmmm. Pasteurization is named for Louis Pasteur who, in 1859, showed how heating up wine or beer would keep it from going cloudy because of microbes. Franz Von Soxhlet, a German agricultural chemist with impressive sideburns and a great interest in milk, was actually the first to suggest sterilizing milk for infants in 1886. Nowadays, it is usually heated to 71 C and then rapidly cooled to kill off bacteria and other microbes.
pH, duh
Bacteria tend to get a lot of bad press. But lactic acid bacteria occur naturally on plants like grasses and can easily end up in milk. They ferment lactose at room temperature and turn it into lactic acid. More acid means more hydrogen ions, a lower pH and a sour taste. Lower pH change the structure of proteins like casein, which gives milk its whiteness, so it curdles into clumps called curds. The leftover yellowy liquid is whey. Apparently, little Miss Muffet was just having unpasteurized milk that had been left out for a while. Microbes like Lactococcus lactis (nominated the Wisconsin "State Microbe") get added back to the milk after pasteurization to make dairy products like yogurt and cheese.
Making Scents of a New Weird Odour
So the sourness is one thing, and curdling is another. Smell is yet another milk phenomenon. After the milk container has been opened, mystery microbes can get back in. And if you leave it out, they can reproduce more quickly. Other bacteria break down milk proteins that result in smelly byproducts. Still others can break down the butterfat that smells bad. And some molds can use lactic acid, break the proteins or attack the fat and give off unappetizing aromas.

fridge coldest setting is 1
freezer warmest setting is 1

Milk can sometimes curdle in a working fridge. But it does sound like your defrost system may be malfunctioning. Can you empty your freezer and inspect the defrost system behind the air circulator fan?

I know that defrost elements sometimes go bad and the controllers can pop too. You should check your operators manual and see how to put the fridge into manual defrost. *(it usually involves turning the fridge light on and off by hand. See if the freezer drains during manual defrost. If you have lots of food that dries out in a frost free unit the moisture contains a lot of contaminants that can plug the defrost drain. Which leads to a blocked air passage between the freezer and fridge sides.

You might want to get a small backup fridge for a while to run this down.
Or just use up the food in your fridge before running the tests.

Good luck and be careful.

You could do the simple things like clean the dust and stuff around the compressor condenser. Check the condenser motor. Good air flow improves performance and cost nothing to fix. Of course if you are experiencing a defrost problem the air from below gets choke out with ice buildup around the evaporator area. If you have frost on the backside of the freezer section changes is you have a broken defrost heater.

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Hello Sir, If the Fridge is not getting cold then first you have to confirm 2 things before you go to seek Repair Service. As you have not mentioned the Model No. or make of the Fridge so I am giving you advises on what can be faulty on a normal basis or these points work for every Fridge.
Have you checked and confirmed that which part of the Fridge is warm. First check the freezer. Check if it is working. If not, it can cause this issue. 2nd Thing is the Compressor. It is the component which is essentially needed for cooling. Kindly diagnose the Compressor. The 3rd thing is the Thermostat. Check that is it working. Also check the Dial.
Kindly diagnose my given points which can be faulty and Reply me. If you find one is faulty, call a Certified Mechanic for the repair.
Reply me if you have anymore things of issues to be solved, if will sort the issue out.
Thank you Sir, Have a nice day.

Have you turned up the dial on the inside?
If thats not it then it needs re gassing or probably cheaper re-placing.
look for any controls and turn them up first !
All the best !

How to check everything
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php
If the evaporator coils behind the back panel of the freezer are icing up because of auto defrost failure that will stop the circulation of cold air and eventually affect the freezer too.

check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.

You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.

Run two or three reservoirs full of plain water through the machine to rinse out the descaler, which is acidic.

Acid curdles milk.

5 is coldest and 1 is warmest