Blew Ice cold air the first time turned on for the season, each time after it blew less cold air, now doesn't even seem to be working properly at all,why?

Ice cold return line can be a sign of low charge.

there are 3 things to be considered,first,if the compressor motor `s connectors are having loose,it gives a hi ampere to your RELAY that can cause to its contacts being fried,second,the compressor motor itself is gaining a hi ampere already i.e. having unusual sound that can cause heavy friction inside the turning mechanism and third the last but not the least,maybe this time,the tubes or the compressor itself having very small holes that causes to the refrigerant to escape and it doesn`t gives off cold air.

From your indications, it sounds like your evaporator fan is not functioning and evenly distributing the cold air throughout the freezer.

Is there frost on the back panel of freezer?need more info.

i just switched out my compressor today after over a year of my air doing this until it finally went out....(it only blew hot air). Replacing the compressor seemed to work. it is pricey though. dealership charges and arm and a leg. (i think the quoted the compressor at like 1000 not including labor.) my knobs are also messing up, but the one that switched from regular air to defrost. they only sell the knobs in a pack of 3 and are charging 300 for that....but i say good luck!!! its pricey...they shoulda recalled the cars. this is a very common problem i have been seeing. all they wanna do is make money off of it.
anyways the new compressor seems to be working.

check the control board in the rear area of the refrigerator for a bad printed circuit trace

Any ice buildup is due to one of 2 problems. Either the defrost circuit is not working properlyor the drain hole where the defrosted water drains down to the underneath pan is clogged. I once found a spider's nest in the drain of a refrig that was in a seasonal house after the winter shutdown.

Very common is a defective (open) defrost thermostat, or a bad defrost timer. But for a unit only 5 yrs old I'd start with the drain hole. BE SURE YOU GET ALL THE ICE OUT. Use hot water, hairdryer etc, so water flows freely to drain pan

There is one compressor, condenser and evaporator in all refrigerators. The part that makes the cold inside the unit is the evaporator. It's in the freezer, behind a barrier on the back wall. It's a "coil" with many small fins. There is a fan that blows air over the evaporator which makes the air cold. This air comes from the freezer and stays in the freezer. The cold food section (the refrigerator) has a control that opens a hole for air to pass from the freezer to the fridge. This being said...you can rule out the "temperature control" for the fridge.

The sound you hear could be the compressor relay, the evaporator fan or maybe something else. It could be bad, it could be not too bad. (Like a fan blade a bit unbalanced with dust)

OK,,, back to the evaporator. There is a little heater next to the coil that turns on every 8 hours or so to defrost the coil. That's called the "defrost cycle". Makes sense, no? If the defrost timer (common problem) or defrost control board (common problem) go bad, your evaporator coil freezes up, and that's not good for anything in your refrigerator. But it can often keep the freezer section cold. You can easily disassemble the evaporator cover in the back of the freezer and take a look. If it looks like a block of ice, you probably have a defrost issue. An even, thin coat of frost is OK, but lots of ice is a no no.

That is definitely a problem. Make sure that all the related filters and coils are clean. If there is ice forming then wait until the ice thaws after checking the filters and then retry.

If this doesn't work you will need a contractor to properly diagnose the system and check for any recalls or manufacturer warranties.

That's a typical sign of the defrost cycle not working and ice is building up on the coils. That prevents proper air flow of cold air around the compartments. As ice builds up you get less air flow and things warm up soooo you turn up the cold which causes more ice to build up and even less air flow soooo you turn up the cold. See where I'm going with this? You'll have to check your defrost timer, defrost t-stat and even the heat element. Look in your owners manual or online for diagrams of where the parts are located on your older unit, then go from there.