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Transmission Fluid Leak From Cooler Line on Pontiac Montana

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 181,647 (140,500–219,190)
4 model years affected: 1999, 2000, 2001, 2002
10 people reported this problem
Viewing 1 - 3 of 3 comments
Trans line repaired but now leaking at radiator
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.