Fridge not getting any air, freezer is working

There has to be something restricting the air flow to the fridge. If the fan is running blowing cold air into the freezer, then it should be cooling the fridge too. Empty out the fridge and freezer and use a blow drier to blow hot air into the duct work. There could be an ice blockage not visible in the duct work.

open the freezer door,do you hear the fan blowing around?it sounds like the evap fan motor isn't running and that's why it's cold on the bottom and not the top,you have to repair this fast or you'll loose your food in the fridge,the fan is what blows the cold air from the freezer to the fridge section.

if you can hear the fan still blowing but no cold air coming up to fridge section a common problem with bottom mount freezers is the door gets left open and the air ducts freeze up and the air can't blow up to the top.turn the control off in the freezer.remove the top shelf and the door,check to see if there are any screws one on each side of the slide arms,if there are remove them and lift the door up and out,with a hair dryer melt out the ice by blowing the hot air up each side of the back wall,also if the back inside wall of the freezer is covered with ice or like snow then you have a defrost problem but if there's no ice on back wall do what i said and blow the air up the sides of the back wall through the vents until no more water is seen dripping through the vent holes,then turn the freezer back on and check to see if you feel cold air blowing in through the vents in the fridge section,if you feel cold air then you're all set,if not keep blowing the hot air up the sides until it's melted out.let me know what you find,you'll know if the door was left open,ice will be on the ceiling near the light switch and sometimes on the top of the freezer door

The fridge gets its cold air from the freezer through a vent(damper) between the freezer and fridge.The fan in the freezer blows air through it. Make sure this fan is running. You may have to hold the door switch in for it to run. There is a flap you adjust with the fridge temp. control. Make sure it's opening and closing when you adjust the fridge temp.
The problem could be the electronic control if you have one or the mechanical linkages.

The fridge gets its cold air from the freezer through a vent(damper) between the freezer and fridge.The fan in the freezer blows air through it. Make sure this fan is running. You may have to hold the door switch in for it to run. There is a flap you adjust with the fridge temp. control. Make sure it's opening and closing when you adjust the fridge temp.
The problem could be the electronic control if you have one or the mechanical linkages.

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.

The fridge gets its cold air from the freezer through a vent(damper) between the freezer and fridge.The fan in the freezer blows air through it.Make sure the fan is running. There is a flap you adjust with the fridge temp. control. Make sure it's opening and closing when you adjust the fridge temp ..

the fan is locted in the freezer and it blows up to the ref and it sounds like the fan quit working and needs replace to check it the be for sure take the back panel off and with the ref running test the leads to the motor and make sure you have 110 volts if you do it is a bad motor

It sounds like the condenser coil might be freezing up. This happened to me on my bottom freezer. The cooling part of your fridge is only in the back of the freezer compartment. The cold air from the freezer blows up through a vent in the back to the fridge and comes out at the top. If the coils do not defrost (which is what happened with mine) the air flow is blocked by the ice and can't get to the fridge compartment. Your freezer will still be cold but your fridge won't. If you pull the plug on it and time things right you can defrost the coils but this will only postpone the problem. Both will work for awhile again until the coils ice up again. You can also pull out the freezer drawere and try to defrost the coil with a blow dryer. You have to disconnect the icemaker and pull out the back panel behind the freezer to get to it though.

Check the damper in the top back of the fresh food section. make sure that it is open and air is coming through it.

Thre is a fan inside the freezer which circulates the cold air around both the fridge and the freezer compartments.
You should be able to feel cold air blowing around the inside, particularly at the top of the freezer.
If the defrost thermostat fails open, the internal fan (depending on freezer) will stop and this can be the cause of the freezer being warm at the top and no ice.
You say the bottom of the freezer is blowing cold, but are you sure its blowing, as it can feel like a cold blow. Of course the fan could have failed or may be the defrost heater itself.
Have a look at this site for some useful trouble shooting
And a good site for troubleshooting and general info
Refrigeration Help Section, Fridges, refrigerators, not cold enough, frost free problems and how to test, noisy fan motors, clicking on and off compressors, door gaskets
Nige