I believe you were miss informed but you don't half to drain your a/c fluid. You have what is called a shrader valve. The pressure switch screws onto the sharder valve . If your issue is in that valve then yes you will lose pressure So no the pressure does not half to evacuated when changing the pressure swith cause the sharder valve will keep the system contained
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I believe you were miss informed but you don't half to drain your a/c fluid. You have what is called a shrader valve. The pressure switch screws onto the sharder valve . If your issue is in that valve then yes you will lose pressure. So no the pressure does not half to evacuated when changing the pressure swith cause the sharder valve will keep the system contained
I believe you were miss informed but you don't half to drain your a/c fluid. You have what is called a shrader valve. The pressure switch screws onto the sharder valve . If your issue is in that valve then yes you will lose pressure but in most settings that is not the problem when just changing the pressure switch. So no the presure does not half to evacuated cause the sharder valve will
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I believe you were miss informed but you don't half to drain your a/c fluid. You have what is called a shrader valve. The pressure switch screws onto the sharder valve . If your issue is in that valve then yes you will lose pressure So no the pressure does not half to evacuated when changing the pressure swith cause the sharder valve will keep the system contained
I believe you were miss informed but you don't half to drain your a/c fluid. You have what is called a shrader valve. The pressure switch screws onto the sharder valve . If your issue is in that valve then yes you will lose pressure but in most settings that is not the problem when just changing the pressure switch. So no the presure does not half to evacuated cause the sharder valve will