🚗 Classic Fault — Mercedes-Benz W126 (1979–1991)
W126 SEC rear window seal leaking
💰 Estimated Repair Cost
$40 – $150 GBP
Parts and labour estimate
🔧 Tools Required
Trim tools, window seal kit
📋 Overview
The SEC coupe rear window seal deteriorates and allows water to track into the C-pillar and boot area.
🩺 Symptoms
- Damp boot carpet
- water ingress at C-pillar trim
- musty smell
- visible water staining inside
🔍 Possible Causes
- Perished rear window seal
- cracked seal
- debris blocking drain channels
🛠️ Diagnosis Steps
Apply water to rear window perimeter with car on level ground — watch for water tracking inside
✅ Most Confirmed Fix
Rear window seal replacement
82% of users confirm this fix worked (16 reports)
🔗 Other Mercedes-Benz W126 Faults
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