1993 Pontiac Firebird Owner's Manual - Page 232

Automatic Transmission Fluid When to Check and Change: A good time to check your automatic transmission fluid level is when the engine oil is changed. Refer to the Maintenance Schedule to determine when to change your fluid. See "Scheduled Maintenance Services" in the Index. II I NOTICE: E How to Check: Because this operation can be a little difficult, you may choose to have this done at a Pontiac dealership Service Department. If you do it yourself, sure to follow all be the instructions here,or you could get a false reading on the dipstick. Wait at least 30 minutes before checking the transmission fluid level if have you 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. 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). To check transmission fluid hot: Get the vehicle warmed up driving by about 15 miles (24 km) when outside temperatures are above 50°F (10°C). If it's colder than50°F ( 1OOC), drive the vehicle in D (Third Gear) until the engine temperature gage moves and then remains steady for ten minutes. Then follow the hot check procedures. 231 = =