I've just installed an old fridge in my kitchen. The fridge hums normally, the freezer works fine, but the fridge part is not cooling properly. Even on the coldest setting, the temperature inside the fridge is not very cool. Is this a fixable problem (dirty coils, clogged pipes) or is the fridge kaput? Any help is much appreciated.

Thanks

Sounds like your defrost switch is bad and your freezing coils are caked with ice. Try replacing the defrost switch and that should solve your problem. It's a very common part that goes bad in defrost models. You can clean the bottom coils as well as they will help but not fix the problem.

Where and how do I replace the defrost switch? It is a very old fridge that hasn't been in use for a couple years, if that helps.

If it is an "older model" the defrost timer may be located behind the kick guard at front of the unit at the bottom. Remove the kick guard, probably by gently pulling out on it at either the top or bottom of the guard. Look to see if there is a metal or plastic component with a modular plug (wires) connected to it. There may also be a slot with a hole in it, this is a manual operator for the timer cam. If you decide to replace this component yourself, before proceeding UNPLUG THE REFRIGERATOR FROM THE WALL OUTLET! Danger of electrical shock if you do not unplug the unit. You will need to go to an appliance parts distributor (such as Marcone Applance Parts) to purchase the defrost timer. You will need to take with you the make (Kenmore, GE, etc.) the model number, and the serial number.
The model number could be behind the kick guard, inside the refrigerator section left or right side inside the compartment, or possibly on the door. Replacement timer cost is usually around $50-$60. Keep in mind that the problem could also be the condenser fan motor, very heavy accumulation of dust (wool) on the condenser coils underneath the unit (or behind the unit depending on age), or a defective defrost heater.

Good luck and let me know how it goes.

I have this same problem: the coils are clean, no ice build up. Still sound like a defrost switch? The freezer works and the fridge section "clicks" on but no cool air comes out in the fridge. Thanks.