| connections and the o-rings on the expansion valve inside the evaporator box. For the sake of finding the leak, it is possible to partially charge the system without an engine. Immersing the R-134a can in a pan of hot water will cause the refrigerant to boil off and force it into your system. You can then detect leaking o-rings with a soapy water solution. While the engine is out is the best time to do a correct retrofit. Flush all of the lines, replace o-rings, remove the evaporator box and flush out the evaporator, etc
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