Whirlpool frig. Freezer warm, frig seems ok.

Sounds like a intermittent problem with the defrost timer. Sometimes they get stuck. Check continuity of the defrost heater and defrost thermostat. If both are good then replace the defrost timer, that should solve the problem.

Check for another fan to cool the fridge side. It could be bad.
murf427

did you check freezer fan behind the freezer? If not working check the wiring for it. If broken fan replace it. Find no leak in door gasket. Temp setting must be at least 5 degree.Thanks.

most likley to be the thermostat for the refrigerator packed up, worst case a broken pipe or compresor

I don't think the darkness is related to the fridge not being cool. 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. There is a flap you adjust with the fridge temp. control. Make sure it's opening and closing when you adjust the fridge temp
OR
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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.

check defrost timer, defrost heater, defrost thermostat. In most newer models the timer has been replaced by an electronic control board. If the heater and thermostat are ok it’ll be the control.
How to check everything
http://www.acmehowto.com/howto/appliance/refrigerator/refrigerator.php

Sounds like the airflow balance is off. When you turn the aircontrol to max what you are actually doing is starving the frig compartment of cold air, cold freezer, warmer frig. It is recommended to set both controls to middle and see if it helps the problem.

check door seals for freezer and fridge. If ok, check frost level in the freezer. Ice present on the back of the freezer panel (evap cover) remove evap cover and check for defrost problem by ohming out heater and defrost thermostat. If both check ok, then test the defrost timer. If this unit new and covered under wty, call a&e factory svc at 1-800-905-9505 for a free repair. consult your owners manual for wty details.

Sounds like a defrost problem. Check to see if there is any frost buildup in the back wall of the freezer. If so, it is not defrosting as it should.

• possible causes:

1. bad defrost timer
2. bad defrost heater (in freezer)
3. bad thermo switch in freezer

If you don’t know what these are then unplug the machine and let the ice melt in the freezer overnight with the door open. Then try it the next day, if is cooling fine then you need to have a service person replace one of the above items.
if you already checked this and think it is a different problem then let me know, i will help you figure it out. 
Mike  

insulated or not, garages are generally too cold for new energy efficient frigs to operate. ambient temp needs to be above 60 to work efficiently.

Is your fan blowing in the freezer? Frost on the back wall of the freezer usually indicates a defrost problem... defrost themostate, heaters, take back panel off and check evap for frost build up and if your fan in working.