Record rainfall in southwestern Ohio revealed water management issues in the author's BMW Z4, despite having a watertight hardtop roof.
Water leakage in the trunk due to faulty rear lamps was causing condensation and potential damage to sensitive components like the hydraulic top equipment.
The water was found around the battery and hydraulics, requiring immediate removal to prevent corrosion and damage.
The trunk water leakage issue was traced back to the rear lamps, where gaskets were improperly seated, allowing water to seep into the trunk.
Changes in lamp design in 2012 aimed at preventing water ingress, but older lamp designs posed a risk of condensation and LED malfunction.
Identifying newer lamp designs required accessing the trunk and checking for filled holes left by removed screws in the bodywork.
Fixing the water leakage issue involved cleaning gaskets, applying silicone glue, and ensuring proper seating of the lamps to prevent condensation.
Regular monitoring and maintenance were emphasized to prevent future water-related problems in the trunk of the BMW Z4.
The author advised potential buyers of E89 Z4 models to check for water issues in the trunk before purchasing to avoid unexpected complications.
Maintaining vigilance in water management serves as a crucial lesson in owning a car, highlighting the importance of proactive maintenance.