if I plug the t/c vacuum line will it stop the hissing,,and so far I haven't found trans fluid in the vacuum lines how can you pin down the problem down with out RR each of the switches?? is there a way to test the switch on the dash?? I can't find a leek in any of vacuum lines.can anyone help with this, I have read the other posting but doesn’t say how I can tell if it’s my T/C vacuum switch??
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