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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
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
Viewing 1 - 2 of 2 comments
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.