Whirlpool fridge and and freezer not cold but all fans are working?

Hello, I have a whirlpool GC5SHEXNB00 2005 side by side Refrigerator.

It has stopped cooling in the fridge and Freezer. I cant check the continuity on the compressor wires but the 2 fans are working good and semi cool air is circulating in both sides. Im not really sure if the compressor is coming on , I dont hear anything but the fans. So embarrassed but the front bottom air flow and coils were solid covered with dust. So I took it outside at this point and had to hose out the whole bottom. There is oil type residue or grease in many areas, the drip pans has a residue as well. I just adopted my grandson and really have no time or money. Funny enough I have another on the side of the house that is broke from only a year old. It is 15 years old now.

Anyway thank you so very much for any help

I am very handy but not with ohm reader and such