Transmission Fluid Leak From Cooler Line on Pontiac Montana

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.

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Average mileage: 181,647 (140,500–219,190)
4 model years affected: 1999, 2000, 2001, 2002
10 people reported this problem
3 people shared problem details
1999 Pontiac Montana219,190
Trans line repaired but now leaking at radiator
2000 Pontiac Montana218,000
I replaced the Rubber hoses.
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.
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