Sorry I guess I wasn't totally clear, I have one of the do it yourself freon kits and the fitting at the end of the hose that is supposed to go over the low port does not clip on, in fact it does not even have the L on it like the high port does. Is there another one somewhere I am not seeing it? Thanks.
Look back towards the windshield side for another port, maybe behind the air intake. I had to refill mine 3 or 4 years ago and couldn't connect to the one you are pointing at either. Son-in-law found that other port, the connector fit and it filled as it should. In fact, I over filled and had to release some of the excess. It sprayed up onto the windshield some, which is how I remember where that port is in case I ever have to do it again.