An automatic transmission fluid leak may develop from the rubber section of a transmission cooler line. In some cases the rubber section of hose can be replaced. In others, the complete cooler line must be replaced to correct this type of leak.Google+
Car Problem Reports
Pontiac Montana Rubber Transmission Cooler Lines Can Leak Fluid
Pontiac Montana Problem
Average Mileage: 183,450 mi (148,900 mi - 218,000 mi)
Visitor, 2000 Pontiac Montana, 218,000 mi
I replaced the Rubber hoses.
Visitor, 2001 Pontiac Montana
Transmission caused van to speed away from a slow acceleration rather than transition smoothly through gears. Found oil sprayed up back of van and around undercarriage. Transmission fluid rapidly lost when car was driven. Oil leak was spotted when the car was moved briefly and observed underneath. The rubber hose was corroded through and will be replaced. Parts were ordered from the Pontiac dealer.