Bought the car in May, the A/C didnt work. I tried to recharge it once, didnt seem to ever get pressure on the gauge. Well a couple days ago, i tried again with a different brand that had a sealant in it (or so the labels says lol). Didnt use a gauge, but it was a small canister, put all of it in. Last 2 days, the A/C has been working kinda. It blows cold ish. Is there anything i can add to make it colder, or perhaps it just needs more r134a?