Chevrolet 2002 Express Van Owner's Manual download pdf (Page 286)

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Automatic Transmission Fluid

If your vehicle has a diesel engine, see “Automatic

Transmission Fluid” in the Diesel Supplement.

When to Check and Change

A good time to check your automatic transmission 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’s GVWR is over 8,600 or

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 your vehicle’s GVWR is not over 8,600 and you do not

use your vehicle under any of these conditions, change the

fluid and filter every 100,000 miles (166 000 km).

See “Scheduled Maintenance Services” in the Index.

How to Check

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 your

transmission. Too much can mean that some of

the fluid could come out and fall on hot engine

parts or exhaust system parts, starting a fire.

Too little fluid could cause the transmission to

overheat. Be sure to get an accurate reading if

you check your transmission fluid.

Wait at least 30 minutes before checking the

transmission 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.

While pulling a trailer.

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Chevrolet 2002 Express Van Owner's Manual Page 286