7MGTE Surround Pipe Coolant Plug Leak - Replacement Plug & Durable Hose Alternative

Coolingbeginner✓ Community Verified

Problem

The coolant plug on the 7MGTE surround pipe (water bypass pipe) leaks or blows off, causing coolant loss.

Coolant leak at surround pipe plugPlug cap blowing off repeatedly (within about a week of installation)

Root Cause

The surround pipe coolant plug (OEM part 90339-16007) and its spring clip can fail over time, and even new OEM replacements with spring clips may not hold on some engines, with the top of the plug blowing off repeatedly.

Confidence

Moderate confidence — Multiple community members agreed on this solution

View Original Thread →Posted October 2025 on SupraForums.com