I'm thinking my AC needs charging on my 2009 Passion. Its a bit weak at times but mostly works good. I found the service ports (Low and High) but I can't get my A/C recharge hose to fit on the the low-side port, does the smart car have an oddball size adapter? I have almost enough room to squeeze the hose on there, but it doesn't want to stay on. I would like to at least check the low side pressure to ensure whether or not I have a full charge.