There are EPA guidelines that must be followed whenever you deal with refrigerant. If you are not EPA certified, you should not be dealing with checking the charge of your unit. Having said that, here is the answer to your question The hose colors are typically: Blue for suction(low side) Red for liquid(high side) Yellow for refrigerant tank
Most automotive places have a freon recharge kits. http://www.bargainoutfitters.com/cb/cb.asp?a=230769&kwtid=203671 I prefer the one with the gauge on it and remember to attach it to the low pressure side. If you are doing a full take down and refill you will need some guages, a vacuum pump, and a recharge system. Because leting the freon out into the air is against the law.
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