The low pressure port should be on the Accumulator, that's the silver cylinder that has the low side A/C line going in to it. You'll see the valve on the cylinder for you to add the R134a, do not aver fill the system. Safest way is to open and close the refill valve and let the A/C run for 2 min and see who cold the system is getting adding little at a time. To much R134a in the system will also give you poor A/C performance, to high of pressure in the system will shut down the compressor also.
Thank you for using fixya and when you think the air coming out of the vent is cold enough, stop charging the system.
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