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2000 Buick Lesabre Overdrive

Tiny
SCOT79
  • MEMBER
  • 2000 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 70,000 MILES
The transmission no longer shifts from 3rd gear into 4th (or overdrive). I didn't notice this until one day I was driving to my son's and happened to look at the tac and the engine was turning at 2000 rpm's driving at the speed of 55 mph. I have an appointment at the Buick dealers sevice shop in the morning. I called the service manager and he said it could be a thermostat or something else not too expensive. I'd just like to know what you think it could be.
Thanks in advance.
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Wednesday, September 3rd, 2008 AT 10:58 AM

1 Reply

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,750 POSTS
A bad thermostat could be the problem. The transmission will not shift into overdrive unless the engine is at operating temp and if the thermostat is stuck open then it will not reach operating temp but usually the check engine light will come on and set a code. Otherwise you will have to rebuild transmission. Lets hope for the best. That transmission will cost about $1500 to $1800 to completely overhaul.
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Wednesday, September 3rd, 2008 AT 8:04 PM

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