GM Service Manual Online
For 1990-2009 cars only

When to Check and Change Automatic Transaxle Fluid

A good time to check your automatic transaxle fluid level is when the engine oil is changed.

Change both the fluid and filter every 50,000 miles (83 000 km) if the vehicle is mainly driven under one or more of these conditions:

    • In heavy city traffic where the outside temperature regularly reaches 90°F (32°C) or higher.
    • In hilly or mountainous terrain.
    • When doing frequent trailer towing.
    • Uses such as found in taxi, police or delivery service.

If you do not use your vehicle under any of these conditions, change the fluid and filter at 100,000 miles (166 000 km).

See Part A: Scheduled Maintenance Services .

How to Check Automatic Transaxle Fluid

Because this operation can be a little difficult, you may choose to have this done at the dealership service department.

If you do it yourself, be sure to follow all the instructions here, or you could get a false reading on the dipstick.

Notice: Too much or too little fluid can damage the transaxle. Too much can mean that some of the fluid could come out and fall on hot engine or exhaust system parts, starting a fire. Too little fluid could cause the transaxle to overheat. Be sure to get an accurate reading if you check the transaxle fluid.

Wait at least 30 minutes before checking the transaxle fluid level if you have been driving:

    • When outside temperatures are above 90°F (32°C).
    • At high speed for quite a while.
    • In heavy traffic - especially in hot weather.

To get the right reading, the fluid should be at normal operating temperature, which is 180°F to 200°F (82°C to 93°C).

Get the vehicle warmed up by driving about 15 miles (24 km) when outside temperatures are above 50°F (10°C). If it's colder than 50°F (10°C), you may have to drive longer.

Checking the Fluid Level

Prepare your vehicle as follows:

    • Park your vehicle on a level place. Keep the engine running.
    • With the parking brake applied, place the shift lever in PARK (P).
    • With your foot on the brake pedal, move the shift lever through each gear range, pausing for about three seconds in each range. Then, position the shift lever in PARK (P).
    • Let the engine run at idle for three to five minutes.

Then, without shutting off the engine, follow these steps:


Object Number: 806387  Size: A2

The dipstick is located toward the back of the engine compartment, next to the brake master cylinder.

The dipstick handle is a bright red loop. See Engine Compartment Overview for more information on location.

  1. Pull out the dipstick and wipe it with a clean rag or paper towel.
  2. Push it back in all the way, wait three seconds and then pull it back out again.

  3. Object Number: 806443  Size: B1
  4. Check both sides of the dipstick, and read the lower level. The fluid level must be in the cross-hatched area.
  5. If the fluid level is in the acceptable range, push the dipstick back in all the way.

How to Add Automatic Transaxle Fluid

Refer to the Maintenance Schedule to determine what kind of transaxle fluid to use. See Part D: Recommended Fluids and Lubricants .

If the fluid level is low, add only enough of the proper fluid to bring the level into the cross-hatched area on the dipstick.

  1. Pull out the dipstick.
  2. Using a long-neck funnel, add enough fluid at the dipstick hole to bring it to the proper level.
  3. It doesn't take much fluid, generally less than one pint (0.5 L). Don't overfill.

    Notice: We recommend you use only fluid labeled DEXRON® -III, because fluid with that label is made especially for your automatic transmission. Damage caused by fluid other than DEXRON® -III is not covered by your new vehicle warranty.

  4. After adding fluid, recheck the fluid level as described under "How to Check."
  5. When the correct fluid level is obtained, push the dipstick back in all the way.