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.Google+
Car Problem Reports
Pontiac Grand Prix Rubber Transmission Cooler Lines Can Leak Fluid
Pontiac Grand Prix Problem
Average Mileage: 143,666 mi (122,000 mi - 187,000 mi)
Visitor, 2006 Pontiac Grand Prix, 122,000 mi
Replaced Cooling Lines because of High Pressure Leak.
Fluid sprayed all over Engine.
It looked like Transmission and Coolanf Fluids