Unidentified Coolant Hose During Rebuild - ISCV / Throttle Body Coolant Line

Coolingbeginner✓ OP Confirmed

Problem

During an engine rebuild, the owner could not identify where a specific coolant hose connects. The hose is attached to a metal pipe that wraps around the engine block and comes up through the intake manifold gap, shaped like a stretched W.

Unconnected coolant hose during engine rebuildW-shaped coolant hose attached to metal pipe around engine block with no obvious destinationHose routes up through the intake manifold gap with unknown endpoint

Root Cause

The hose is part of the idle speed control valve (ISCV) and intake manifold coolant loop used for deicing. Its matching connection point on the ISCV / bottom of the throttle body is not immediately obvious during reassembly.

Confidence

Moderate confidence — Original poster confirmed this resolved the issue

View Original Thread →Posted April 2021 on SupraForums.com