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Got a coolant leak, don't own or want to rent a pressure tester.... Make your own from an old expansion tank cap! Works like a charm! Found my leak in seconds ..

Drill a hole the same size as your air blower gently apply air pressure to system ... Don't get stupid you will blow out a hose ...

Gas Bicycle part Automotive tire Electric blue Auto part
Blue Automotive tire Gas Electric blue Auto part
 
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