# Overdrive not functioning properly/possibly tourque lock up? **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** lesabre, buick\ **Created:** [September 12, 2016, 4:58pm UTC](https://community.cartalk.com/t/overdrive-not-functioning-properly-possibly-tourque-lock-up/95581 "2016-09-12T16:58:13Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![bag445](https://avatars.discourse-cdn.com/v4/letter/b/278dde/32.png) [@bag445](https://community.cartalk.com/u/bag445)\ **Post date:** [September 12, 2016, 4:58pm UTC](https://community.cartalk.com/t/overdrive-not-functioning-properly-possibly-tourque-lock-up/95581/1 "2016-09-12T16:58:13Z")
Hello everyone and hope everyone is having a wonderful Monday, My 97 Buick Lesabre overdrive is acting up and I never have this problem before. When I first start the car and drive I have no problems at all but when I sit and Idle and start driving (I do not drive at a green light like the duke of hazard) OD starts to jolt and buck. When I shift into third and get up to 45 mph and shift back the car is fine like nothing happened. It happens also when the car is sitting and I start it up no check engine lights etc. When I drive the blend doors of the A/C (when I have it on) shifts to the windshield when I drive and about 15 min the blend door shifts back to the mid vents. With the A/C on the transmission is struggling to speed up but when I shut off the A/C the car speeds up normally. I went to auto zone to have them check the computer of my car and it doesn’t give any codes for the transmission just basic codes for a gas cap etc. I do not know if the torque lock up is the problem. I check the transmission fluid and its still red and has no smell to it. I don’t want to continue driving the car to the point of damaged but I have no clue what is wrong. The car is due for an oil change next week (nearly meeting the miles for the oil change) and I would like anyone please any clarification or some information i can give to my mechanics when I take the car in and as well learning. Please and thank you ---
**Author:** ![Triedaq](https://avatars.discourse-cdn.com/v4/letter/t/65b543/32.png) [@Triedaq](https://community.cartalk.com/u/Triedaq)\ **Post date:** [September 12, 2016, 5:15pm UTC](https://community.cartalk.com/t/overdrive-not-functioning-properly-possibly-tourque-lock-up/95581/2 "2016-09-12T17:15:21Z")
It almost sounds as though there is a problem with the AC putting too much load on the engine. The transmission is trying to help the engine by not shifting into a higher gear. The AC compressor may be the culprit.