Transmission Fluid Leak From Cooler Line on Pontiac Bonneville

The rubber section of an automatic transmission cooler line may develop a fluid leak . In some cases the leaking section of hose can be replaced. In others, the complete cooler line must be replaced to correct this concern.

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Average mileage: 147,456 (75,000–200,815)
15 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005
20 people reported this problem
2 people shared problem details
how to remove the transmission lines
cut line and added a replacement rubber hose
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