I HAVE ABR18 BOTTOM FREEZER. THE COILS WERE VERY DIRTY AND STOPPED FREEZING. I HAVE CLEANED IT AND IT RUNS BUT DOESN'T SEEM TO GO BELOW 40.

While it's good that you cleaned the coils and that needs to happen periodically to maintain efficiency in the operation of your fridge, it appears not to have fixed your problem. It could be that you have developed a leak in the sealed system, and have lost refrigerant causing it not to cool. Or you may have a problem with the defrost system. All frost-free refrigerator-freezers have a thing in the system called a Defrost Timer. The thing is a little clock of sorts that tracks accumulated running time. Every 8 hours of run time the thing cycles through a defrost cycle. The defrost cycle is necessitated by the humidity that forms ice crystals on the freezing coils, if the frost is not eradicated it can build up to the point where no air flows over the coils to chill the inside of the box. (it may keep the freezer cold but no air goes to the fridge part. If completely solid neither cools) Most timers are located on the front of the machine, behind that removable grille under the door. The timer has a round hollow shaft through it, and can be turned with a screwdriver. If the compressor is running, give the shaft a slow twist until a click is heard. The compressor will stop. Give the fridge an hour to defrost the coils, and check it to see if it took off running. If an hour has passed and the fridge hasn't restarted, advance the timer again to start. Sometimes the nudge will make the timer run for a while. If this is the case, the unit will chill, and buy you some time to get it fixed. If the timer does not run, you can repeat the process daily until you get a replacement timer. If we're on the mark here, the pan underneath may not hold all the water, and a small flood will result. If the coils are frozen over and it's not the timer, there may be a failure of the thermodisk or the heater coils in the evaporator.That repair is more involved.