Here are your parts
Replacement parts for WHIRLPOOL ED22PQXDW01 | AppliancePartsPros.com

Here is the tech sheet
http://www.servicematters.com/d...0Sheet%20-%202176838.pdf

Is there a defrost timer that could be bad? the outside of frig is very warm.

Before proceeding you need to do some more diagnosis
Check that the compressor is running. Should be warm and you should be able to feel it vibrating.
If OK.
Check that the compressor/condenser fan is running. Also that the condenser coils are clean. These are often the cause of a warm outside/case of a unit. In extreme situations it can effect the cooling.
If OK
Remove the evaporator coil cover and check the coils.
Check that the evaporator fan is running.
If heavily iced/frosted over you probably have a defrost problem.
If there is only frost on one section of the coils (usually where the freon enters the coils), you may have a low freon situation. This is often the end of a units life as finding the leak and getting it recharged is fairly expensive.
If no frost at all you could be right out of freon or the compressor is toast.

Here are a couple good sites with basic unit repair info
http://www.applianceaid.com/refrigerator.html
Refrigerator Repair Guide: How To Fix a Refrigerator - ACME HOW TO.com