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Q: A/c over charged. on 1998 Volvo V70 XC

I was adding freon to my car because it wasn't blowing cold. I was using one of these do it your self cans with a gauge attatched. I took it up to what I thought was the correct level. Disconnected lines and closed the hood and suddenly I saw a blast of freon shot out from under the hood. What did I do blow a line. Not blowing cool no more. One hose looks grey at the end.
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Its sounds like one of the hoses has blown out. To repair the leak the system will need to be evacuated (if any pressure is left. Moisture is an enemy of the air conditioning system so the reciever dryer may also now need to be replaced. After the hose is replaced the original leak that caused the loss of refrigerant will need to be fixed. The system will need to have all leaks fixed prior to properly recharging the system with refrigerant.
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