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Mercedes-Benz S420 Problems

Coolant Leak Due to Cracked/Broken Heater Core Outlet Housing on Mercedes-Benz S420

Problem Description and Possible Solution

A cracked or broken heater core outlet housing can cause a coolant leak near the bulkhead (firewall). Our technicians remind us that coolant leaks should be repaired in order to avoid overheating the engine due to coolant loss.

(8 people reported this problem)

Mercedes-Benz S420 Vehicles With This Problem

RepairPal Verified
Average mileage: 146,800 (146,800–146,800)
6 model years affected: 1994, 1995, 1996, 1997, more1998, 1999
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Brake problem? Or maybe a faulty head gasket cylinder?
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