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Super Moderator
1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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23,851 Posts
Your radiator fan must come on or at least cycle on with the compressor in order to cool the condenser. Without the condenser being cooled by passing air, high-side pressures will skyrocket and dump out the high-pressure safety valve.
Driving along with air moving through the condenser and radiator, you may not need the radiator fan on. Diagnose for that.
It is not good to indiscriminately just add refrigerant without first seeing if it needs it first. If it does need it, you probably have a leak anyways (it is supposed to be a closed system). Now there is no way of knowing how much refrigerant is left in the system. Always diagnose first.
 
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