I have a little more info to add to this puzzle. About a year ago we put on a new compressor. I found the expansion block that got changed when the compressor got changed. It has a Parker number on it. 329-412 It also has R-134A printed on the block. I compared it to a Four Seasons expansion block l...

Valve can only go one way.

Friend at the parts store sent this.

Any idea how far it will need to be backed out?

I got the expansion block at a local parts store. After the guy at the store saw the condenser and block, he said it looked like R-12 technology to him.

This is a pic of where the expansion valve goes. When all four hoses are connected, it is held up close to the fins of the evaporator. This is the side where the warm air is pulled in.

Does this look like the adjustable variety? If so, would I screw it in or out to decrease the superheat?

It’s mounted in the cab on the inside of the roof. It is in a plastic case. There are flexible vent hoses in the case that direct the cool air to the front and rear of the cab. It is a crew cab and it’s a pretty large area.

I recently replaced the txv. Still have the old one. Will look for an adjustment. If it isn’t adjustable, could the txv be insulated from the evaporator to get it to supply more refrigerant?

Yes, it is.

I have a pic where it mounts, but the file is to large. It doesn’t have a sensing bulb going to the txv. There is a sensing bulb stuck in the evaporator coil that goes to an electronic switch. I think it cuts power to the compressor if Evap gets too cold. The txv is mounted up close to the evap fins...

This was a friends father in laws truck. He said he put in a new relay for the ac and it started working. I change out the relay when I had it with another relay from his fuse panel. Didn’t work for me. I wonder if the auto ac just finally reset itself?

Thanks for all the help!