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Home >> Porsche >> 2000 >> Boxster Base, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine >> Engine, Cooling >> Check For Coolant Leaks >> Test, Single-Step Cap

Test, Single-Step Cap

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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.