GMC Yukon Denali Problem Report
GMC Yukon Denali Overheating and/or Coolant Loss Due to Leaking Quick-Connect Fitting
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.
HAD THE SAME "FITTING" PIECE ISSUE. - Visitor
Heater core hose quick connect leaking. - Visitor