🚗 Classic Fault — Mercedes-Benz W115 (1968–1976)
Radiator bottom hose collapsing under suction
💰 Estimated Repair Cost
$15 – $35 USD
Parts and labour estimate
🔧 Tools Required
Hose clamp pliers
📋 Overview
The lower radiator hose collapses internally as the reinforcing wire rusts through. The hose looks normal externally but collapses under suction at higher RPM.
🩺 Symptoms
- Overheating worsens with higher RPM
- lower hose looks normal but feels soft when engine running
🔍 Possible Causes
- Collapsed lower radiator hose
- missing or rusted internal wire coil
🛠️ Diagnosis Steps
Squeeze lower hose with engine warm and running — it should be firm. A soft or collapsing hose confirms failure.
✅ Most Confirmed Fix
Replace lower radiator hose.
88% of users confirm this fix worked (35 reports)
🏷️ Parts Needed
Lower radiator hose for W115
🔗 Other Mercedes-Benz W115 Faults
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