The AC blows cold air 43° F for a minute then rises to 65° for a few minutes. It alternates back and forth. The system shows full charge. Is it possible the heater valve is the issue creating this. The heater valve is stuck in the open position. I'm picturing that hot coolant is a constant flowing the the heater core not letting the AC to stay at the 43° temperature.

 

What year, model, engine (v6 or 4 cyl), etc. accord do you drive?

If the heater valve was stuck open, the air through your vents would stay hot at all times.

How are you checking pressure on the system?

 

I took a pressure reading on the through the low side of the AC line and it was 3/4 into the green. Running the AC in the shade it stays colder longer but in the hot open sun it fade in and out cold than warm.

 

Those gauges on the recharge kits aren't great at diagnosing your a/c system. I'd recommend getting an a/c manifold that measure the high and low pressure lines to get a better idea of how your system is performing.

You can also take a look at the a/c compressor clutch to see if it keeps spinning when the a/c is turned on. Or if the compressor clutch disengages when your temperature increases inside the car.

You may also want to get HVAC codes. The common diy thread on top of the gen tech help forum has a link to check hvac codes on your car. It may help identify a possible issue with your a/c system.

 

All excellent points. I will check to see if the compressor is acting wonky or not. If the compressor is acting normal I will try to get my hands on a A/C manifold kit.

 

I think some autoparts stores have an a/c manifold that you can get as a loaner tool. You just put down a deposit and the money is refunded when you return the tool.