Overheating and/or Coolant Loss Due to Leaking Quick-Connect Fitting on Cadillac Escalade

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: 143,750 (134,000–150,000)
4 model years affected: 1999, 2000, 2002, 2005
7 people reported this problem
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problem details
2005 Cadillac Escalade 134,000 mi,
Snap on split connector at firewall.
2005 Cadillac Escalade 149,000 mi,
replaced quick connect still leaking
2005 Cadillac Escalade 150,000 mi,
After repeatedly needing to refill the coolant reservoir, looked for the source and easily found traces of coolant on transmission oil filler tube, directly below the quick connect fitting on coolant line going through firewall. The tee connector needed to be replaced.