Petcock on radiator
Thsi seems like a dumb question but I went to drain cooling system today. Turned petcock on lower radiator 1/4 turn and nothing came out,does this unscrew more than a 1/4 turn? Plastic so I don't want to force. Stuck a tooth pick up there to see if it was plugged but nothing . Rad cap is off and evaporation tank cap it off heater to max. What the #@$%^%^^%$#@@$%^^!!!!
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