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.

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
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
Viewing 1 - 2 of 2 problem details
1997 GMC Suburban 2500 117,000 mi,
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!
1999 GMC Suburban 2500 75,000 mi,
Caused heater hose nipple in front part of intake manifold to corrode and required replacement with new threads and larger pipe.