Freezer is working but fridge is not cooling

So if the freezer is working fine but the refrigerator isn't, you probably have airflow problems. In many cases, the freezer moves cool air into the fridge using a diffuser. Sometimes, the diffuser duct gets clogged up with ice, and you can verify this by listening to the evaporator fan.Jun. 13, 2019

RV Refrigerator Not Cooling, but Freezer Is? Here's ... - VEHQ

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There should be a fan in the freezer that moves cold air into the fridge. The fan might not be working. The temp setting for the fridge is a door that opens and closes depending on the setting. Check to make sure it works.

Check the condenser grille on the back is clean and warm to the touch. It should cool down towards the bottom and the drier cooler still. If it's cold, suspect short of refrigerant. If it's hot, move the fridge away from the wall to help it cool down.

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If there is no cooling at all on the fridge section but the freezer works then it is confirmed that the compressor and gas pressure is OK. Now shut off the fridge and leave it powered off while you clean and check the evaporator for frost. If frost is seen it is a good indication as the compressor is working with sufficient gas within.
Now after about 6 hours plug in the fridge to start. Observe cooling to happen in about one hour and ice to from under three hours.
Earlier make sure that the thermostat was set to normal mode for freezer and fridge.
However if ice forms in the freezer then observe the fridge for about 24 hours for cooling to continue and the fridge to cut off . If not the auto defrost timer, or the thermostat must be checked. Frost formation without defrosting could block the air flow and so shut the air passage to the fridge. Also the blower fan must work and if this is not working then the fan can be faulty. Also a fault on the control unit is a suspect to non functioning of any one of these components.
If defrost timer works but frost keeps forming check while the compressor shuts if the heaters are working, check continuity of the heaters.
So try this test using a multi-meter on the defrost timer and the thermostat and make your observations so that we come to the solution.

Please check the link below for tips to remove the panels/parts:

http://www.espares.co.uk/advice/fridges-and-freezers/a/2

The refrigerator half of a refrigerator/freezer does not produce any cold! The refrigerator is cooled by transferring air from the freezer to the fridge. The fridge temperature setting controls a flapper between the freezer and the fridge. There should be a fan which blows air from the freezer into the fridge (through the damper).
If the ice forming in the freezer is concealing the cooling coil and air can not move through the coils, then the overall result will be a warm freezer (even though there may be ice in one location) and a warmer yet fridge. This can be tested by unplugging the fridge and allowing a complete thaw. If the ice is the cause of the problem, then it should work for a short while until it freezes up improperly again
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the cold coil is in the freezer side at the bottom . the fan moves the air over coil . ck that your fan in freezer is working . mm

Some fridges only cool the freezer and an evaporator fan motor moves cool air from the freezer to the fridge side. If this fan doesn't spin very freely then it may need to be replaced. You should also pull out the fridge and see where the drain hose is connected to the inside of the fridge, try pouring hot water down the hose to see if it is open. It may be clogged with a pea or some food or frozen. If your fridge is really full, make sure there is nothing in front of where the evaporator fan blows air into the fridge. Make sure that the adjuster flap is open in the fridge section.

the freezer actually cools the fridge via a fan usually located in the "ceiling" of the fridge. make sure this is working and check yur temp contols make sur they are adjusted right

Let freezer get down in temp and fridge should start chillg.Good luck

Without knowing the type of fridge(side by side, freezer on top etc.) all I can offer is this: Somewhere between the freezer and the fridge there's an opening thermostatically controlled to transfer cold air from freezer to the fridge. Most have a fan to move the air. So either the fan (if so equipped) stopped, and need to replace, or opening is stuck closed, or plugged.
If freezer is working fine, this is the only problem I can think of.
Hope this helps