GMC Suburban 2500 Problem Report

GMC Suburban 2500 Overheating and/or Coolant Loss Due to Leaking Quick-Connect Fitting

(10 reports)

The quick-connect fittings for the heater hoses tend to leak engine coolant. This problem commonly occurs because the metal housing has become brittle, which can break and cause leaks.

Coolant leaking from back of engine traced back to the quick connect fitting in left front top of intake manifold- I plan to replace the hose, or sealing ring if possible, since coolant is leaking from around the rubber ring at end of hose. I thought the leak was coming from a bad intake manifold gasket. What a money saving relief! -
Caused heater hose nipple in front part of intake manifold to corrode and required replacement with new threads and larger pipe. -
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