Heater Hose Outlet May Leak Coolant at Back of Intake Manifold on Mercury Grand Marquis

Submitted by Vehicle Owner · Sep 25, 2025
Published by RepairPal

Problem overview

The heater hose outlet may leak coolant at the back of the intake manifold. Sometimes this is misdiagnosed as a leaking intake manifold gasket because it resembles a leaking manifold.

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