Evaporator fan motor makes a growling noise when first starting up and after about 2 minutes it stops growling and resumes its normal running sound for the rest of refrigerator cycle.Then it starts again on its next cycle.
Here are your parts
Parts for LFTR1814LWG - AppliancePartsPros.com
You seem to be missing the last digit so you will have to choose the correct unit from the Matching Model numbers section.
If you click on a parts description or picture a new page will open will more info about it, that may be useful to you.
Sounds like the fan is starting to go.
I would replace it.
Sorry just a double of my previous post.