Car Problem Reports

GMC 1500 Pickup Quick-Connect Fittings For Heater Hoses May Leak Engine Coolant

GMC 1500 Pickup Problem
13 Reports
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Model Years Affected: 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999

Average Mileage: 144,000 mi (135,000 mi - 153,000 mi)


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.

  •  Enthusiast

    The quick connect fitting at the rear of the intake manifold broke off where it screws into the manifold. Engine overheated before I knew what was happening. Resulted in a complete overhaul to repair the problem.Very poor design for a quick connect fitting.

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