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Home >> Porsche >> 1997 >> Boxster Automatic >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine >> Engine, Cooling >> Check For Coolant Leaks >> Test, Single-Step Cap
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Test, Single-Step Cap

Part number 443 121 321

  1. Generate excess pressure.
  2. The pressure relief valve opens and the pressure remains constant at an excess pressure of 1.3 bar. If the pressure decreases, replace the cap. The two-step cap is the preferred version.
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