AC blows hot air ONLY AFTER started to drive!

[lucienbond24@yahoo.com]

Hello,
I am in need of some help, please, troubleshooting the cause of the AC in my car not working properly…

I have a 2008 Toyota Yaris.
If I sat in parked position, even for 30 minutes with the AC blasting, I have so much cold air that I cannot stay in the car anymore.

As soon as I start driving three minutes after, the cold air starts to get warmer and warmer until only warm air comes out.
I have attached a gauge to the low pressure valve and when the compressor is running at the beginning is at normal level (green right in the middle), but after I have driven a mile or two, The air starts to less cool and the get warmer.
I park the car with engine and ac stil on at max power, go check the same gauge and it’s now on red almost at max red.

This is one of those gauges that come with the DIY refill kits.

If I leave the car running, as it is on red after about five minutes, the pressure gauge goes right back to normal and the AC starts blowing again super cold air.

Why is the AC not blowing cold air after I started driving?

I really love to do things all on my own And not go to mechanic shops or dealerships; so any help that anyone could give me to fix this AC problem is very much appreciated.

I also have recorded couple of small videos that I could post or send for clarification…

Thank you.