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How often do you change the coolant in your self contained tigs? My Synchrowave 250 dx miller is acting up while welding aluminum, my welder repair man is led to believe that the coolant "might" be contaminated, he says he checked everything else out and the machine checked out fine. The problem is when you strike an arc it will blow a hole through the work piece. You can turn the amperage as low as you want but when you strike an arc the voltage goes crazy.