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.
Car Problem Reports
GMC Yukon Denali Quick-Connect Fittings For Heater Hoses May Leak Engine Coolant
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Visitor, 2005 GMC Yukon Denali, 170,000 mi
Heater core hose quick connect leaking.
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