Maytag fridge not cooling

My Maytag stopped cooling. I took the rear cover off and unplugged the fridge. I waited 10 min and plugged it back in. I heard a clicking noise but was not sure if it was the capacitor of the overload relay. I tapped on both and the compressor started. What should I replace? Also when I looked up the model number it comes up with 2 different models.They are PTB1753GRQ and PTB1753GRW…what is the difference between the two?

Here are the parts
Replacement parts for PTB1753GR models | AppliancePartsPros.com

[COLOR=“Blue”]My Maytag stopped cooling. I took the rear cover off and unplugged the fridge. I waited 10 min and plugged it back in. I heard a clicking noise but was not sure if it was the capacitor of the overload relay. I tapped on both and the compressor started. What should I replace? [/COLOR]
Clicking will not be in the capacitor so probably it is the overload/relay especially since it has been re-designed.
Here is a good link on how to check things
Refrigerator Repair Guide: How To Fix a Refrigerator - ACME HOW TO.com

[COLOR=“Blue”]Also when I looked up the model number it comes up with 2 different models.They are PTB1753GRQ and PTB1753GRW…what is the difference between the two?[/COLOR]
Do not know but in this case it does not matter as both units use the same compressor etc.