Overheating and/or Coolant Loss Due to Leaking Quick-Connect Fitting on GMC Yukon Denali

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: 128,750 (90,000–170,000)
6 model years affected: 1999, 2000, 2005, 2006, more2007, 2011
7 people reported this problem
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problem details
2007 GMC Yukon Denali 90,000 mi,
Had this problem and you need a special tool to take it off cost me $100. Apparently I've had almost ALL these problems listed on this site. GM is a crap cars of America. Last time ever buying a $60k pile of junk from them.
2011 GMC Yukon Denali 97,000 mi,
HAD THE SAME "FITTING" PIECE ISSUE.
2005 GMC Yukon Denali 170,000 mi,
Heater core hose quick connect leaking.