Lynx fridge freezer the freezer

check if there are frost at the back of the freezer wall, if there is then you have a defrost issue.

if not, check the vents if air is coming out on the fridge side. close the freezer door, press the door switch on the fridge side and feel the air. if there is no air, the evaporator fan could be shut.

if there is little air, check the vent, insert a small rigid wire, push the vent or flapper open and make the air stronger. you have a vent controll problem.

if there are ice in the vent, thaw it out and hope it won't freeze again.