1998 Chevrolet Blazer Owner's Manual - Page 286

How to Check Because this operation can be a little difficult, you may choose to have this done at your GM dealership Service Department. If you do it yourself, be sure follow all the instructions to here, or you could geta false reading on the dipstick. Wait at least30 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. 0 While pulling a trailer. NOTICE: ~ Too much or too little fluid can damage your of transmission. Too much can mean that some the fluid could come out and fall on hot engine a parts or exhaust system parts, starting fire. Be sure to get an accurate reading if you check your transmission fluid. To get the right reading, the fluid should be at normal operating temperature, which 180°F to 200°F is (82"C to 93 " C ) .See "Checking Transmission Fluid Hot" in the Index. 6-16