Welcome to 2CarPros.
It could be several things, but to truly identify the cause, I need to know both the high and low side pressures when it is running. In addition, I need to know the outside temperature when it is checked.
Most people check low side pressure. Since you checked high side pressure, I assume you have manifold gauges. If you could, let me know both sides. It could be low on Freon.
Here are a few links you may find helpful:
https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak
https://www.2carpros.com/articles/air-conditioner-how-to-add-freon
https://www.2carpros.com/articles/re-charge-an-air-conditioner-system
If you could, let me know the pressures and temp when tested. It will be very helpful.
Take care and I will watch for your reply.
Joe
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Sunday, August 18th, 2019 AT 8:20 PM