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

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.

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Average mileage: 96,000 (75,000–117,000)
8 model years affected: 1992, 1993, 1994, 1995, more1996, 1997, 1998, 1999
10 people reported this problem
2 people shared problem details
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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