My 1996 Cadillac Seville won't shift into overdrive. Any suggestions???

Asked by Oct 14, 2014 at 10:21 AM about the 1996 Cadillac Seville STS

Question type: Maintenance & Repair

When driving 45 mph or less the car operates at about 1800 rpm.
55 = 2100 rpm
65 = 2500 rpm
75 = 3100 rpm  
The transmission starts to get hot at speeds above 55 mph. If I stay off the interstate the car runs perfectly. I just had a major tune up, other than the high operating speed and a slight increase in temperature (I constantly monitored the temp when driving for diagnostics) the car is running perfectly. The car has 117,000 miles. Also, this car lived in Alaska for the first 18 years of its life. I recently relocated to Florida, I'm pretty sure that my car does not like the hot temps!

7 Answers

233,115

The overdrive band in your transmission might be burnt not allowing it to engage keeping your rpms high. Only way to fix is to replace, which always means a transmission rebuild. Drive it as is until you can repair it, or consider another vehicle.

1 out of 1 people think this is helpful.

Thank you Tom. That is what I figured. It is good to know how to get the most out of it before I move on.

6,975

have u ever replaced the vacuum modulator?

2 out of 2 people think this is helpful.

No Jason, I have not. Would it be worth doing this?

6,975

it is worth a try.. you can do it on your own. it is inexpensive.

20

Where is vacuum modulator located.

2 out of 2 people think this is helpful.
10

"Overdrive band" ??? I have been told there is none on this tranny, it is electric and uses an auxiliary steel gear with an electric solenoid. Who is right? Is this a "throw-away" GM transmission?

1 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

Seville

Looking for a Used Seville in your area?

CarGurus has 315 nationwide Seville listings and the tools to find you a great deal.

ZIP:

Search Cadillac Seville Questions

Cadillac Seville Experts

#1 Tom Demyan
Tom Demyan
Reputation 370
#2 carpetguy53
carpetguy53
Reputation 340
#3 Js08016
Js08016
Reputation 320
View All

Related Models For Sale

Used Cadillac DeVille
5 Great Deals out of 1,623 listings starting at $2,800
Used Cadillac Eldorado
341 listings starting at $2,900
Used Chevrolet Impala
525 Great Deals out of 29,877 listings starting at $799
Used Chevrolet Corvette
98 Great Deals out of 20,456 listings starting at $3,495
Used Mercedes-Benz S-Class
144 Great Deals out of 6,614 listings starting at $1,200
Used Lincoln Continental
4,151 listings starting at $41,448
Used BMW 7 Series
184 Great Deals out of 6,076 listings starting at $2,999
Used Honda Accord
770 Great Deals out of 88,118 listings starting at $1,150