To my knowledge, the AC system on my '98 V70 AWD has never been recharged (119K miles). It works pretty well, but with things heating up, I am wondering if I can get it to work better--It does not cool things nearly as well as the system in my '04 XC90. I have and have used before a DIY AC recharge system, so I can easily go get a can of 134A, but I have never charged a working system before. Is it a bad idea? Should I release the pressure that is currently in the system before I recharge? Should I "top it off"? Should I just leave well enough alone?
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