I have currently been having problems with my a/c.

I have already changed the low pressure sensor, and heater control valve.

My situation is a/c blows nice cold then after a good while on the road it just blows regular air, non cold.

I've already put freon as well into the tank.
I have also notice every once in a while when I first turn my truck on then the a/c shortly after I hear like a loud pop/bang noise on the right side of the hood where the a/c components are located (viewing from driver side)

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1999 Ford Ranger XLT 4x4
3.0 V6 Fuel Flex Engine

Maybe the blend door is malfunctioning


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2002 Ford Ranger XLT 4x4, ext. cab, Stepside, Auto, 4.0L v6

Would there be any way to do a possible test to see if that would be the problem?

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1999 Ford Ranger XLT 4x4
3.0 V6 Fuel Flex Engine

Next time the problem happens you need to see if the compressor is running before jumping to a conclusion. If the compressor is running and the liguid line is warm to hot and the suction line is cold, the blend door is an issue.
Use the search function and type in blend door, there are quite a few excellent threads on this issue.

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I've been having a similar problems with my Ranger.

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2008 XL SuperCab
2.3 Automatic/4x2

It turns out that the ac clutch was pretty worn out so I ended up taking out the small spacer between the clutch and the magnet.

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1999 Ford Ranger XLT 4x4
3.0 V6 Fuel Flex Engine

Thanks for the update, I'll make a note of it.

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2008 XL SuperCab
2.3 Automatic/4x2