" I'm a total novice and would like an experts opinion on whats happening. "

Before doing anything else,look to see if the wiggle pin has fell out of the wobble shaft.

a TVX is a refrigerant modulating device, limiting the flow of refrigerant thru the evaporator coil. (In heat pumps they can also be in the exterior condenser.)

Because more and more parts are being made in China, Mexico and elsewhere these devices among others are more likely to fail regardless of the brand of AC or heat pump.

Typically when a TXV fails the interior mechanism closes and due to the lack of refrigerant flow this closure causes, the evaporator freezes up.

As time goes on it will eventually cause the AC or heat pump to not work at all. Replacing the TXV is the only way to really fix it, but due to these kinds of parts being made in China & Mexico as already mentioned, the new part may not last but a few years. Some of that can possibly be attributed to the design of the system and quite possibly how the new valve is installed.

Many instances I've seen of these kinds of failure, the valve is often factory installed in the evaporator coil. (Only because this how I (personally) often find the failed device.)

There are other options to repair these kinds of problems to reduce the risk of 'repeated' failure but those options greatly depend on the equipment in question and 'who' is doing the work.

I service the Katy, Texas area.

What you describe may be a reversing valve issue. Here is trouble shooting link.

Hopefully you will find someone who has the capability to diagnose and fix the problem properly. Was this tech confident he know the TXV valve was the problem who was he guessing?

Hey, thanks for the feed back. He seemed certain it was the TXV valve and mentioned banging on it to attempt to get it to move. I don't think it's the reversing valve because it will change from heating to cooling. But after a period of time in cooling, the house will warm up and I won't feel any fluid running through the line. And the line will no longer be cool to the touch. I'm hoping it sorts itself out, because the cost to replace this thing is pretty steep. And I couldn't find a company willing to 'pump down' the refrigerant in order to do the repair. They all want to charge me for vacuuming the line and replacing the refrigerant afterwards. But, I'm going to keep using the old Windows 95' fix until this thing quits working completely.

@Klem

Never toggle the toggles unless you know what the toggles toggle.