We bought this car 2 weeks ago. We noticed the air conditioning on the first day wasn't very cold but thought it needed charged. The air blows and the compressor kicks on. Initially, it was blowing cold on the vents by the doors and hot on the center vents (the knob with the 3 blue dots was set correctly).

Yesterday, we topped off the freon. That didn't help, so it was drained, vacuumed and refilled. It's still hot. The pressure showing on the low side gauge reads 75 before and after it was refilled. When the compressor kicks on, it drops to around 70.

Has anyone had this experience or know what could be causing this to happen? Thanks in advance!