🚗 Classic Fault — Mercedes-Benz (1976–1985)
W123 sunroof drain channels blocked — water ingress
💰 Estimated Repair Cost
Up to $20 USD
Parts and labour estimate
🔧 Tools Required
Flexible drain rod, compressed air, small funnel
📋 Overview
W123 sunroof drain channels become blocked with leaf debris, causing water to overflow into the cabin via the A-pillars and front footwells.
🩺 Symptoms
Water dripping inside cabin around A-pillars. Damp carpet at front footwells. Musty interior smell.
🔍 Possible Causes
Leaf debris and accumulated grime blocking drain channels. Kinked drain tubes.
🛠️ Diagnosis Steps
Pour a small amount of water into the sunroof tray. Water should drain away in seconds. If it pools, channels are blocked.
✅ Most Confirmed Fix
Clear all four drain outlets with flexible rod or compressed air. Confirm flow from all four outlets.
94% of users confirm this fix worked (27 reports)
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