1998 GMC Safari Owner's Manual - Page 283

Wait at least 30 minutes before checking the transmission fluid level if you have been driving: 0 0 When outside temperatures are above90°F (32°C). At high speed for quite a while. Inheavytraffic 0 0 -- especially in hotweather. While pulling a trailer. To get the right reading,the fluid should beat normal operating temperature, which 180°F to is 200" F (82°C to 93 "C). See "Checking Transmission Fluid Hot" in the Index. Checking Transmission Fluid Cold A cold check made afterthe vehicle has been is sitting for eight hours or more with the engine off and is used only as a reference. Let engine run at idle for five the minutes if outside temperatures 50°F (10°C) or are more. If it's colder than 50°F (lO"C), you may have to idle the engine longer. Should thefluid level be low during a cold check, you perform a hot check must before adding fluid.This will give,you a more accurate reading of the fluid level. Checking the Fluid or Cold Hot 0 Park your vehicle on a level place. Keep the engine running. 0 With the parking brake applied, place the shift lever in PARK (P). 0 With your foot on the brake pedal, movethe shift lever through each gear range, pausing about for three secondsin each range. Then, position shift the lever in PARK (P). 0 Let the engine run atidle for three minutes or more. Checking Transmission Fluid Hot Get the vehicle warmed up by driving about miles 15 (24 km) when outside temperatures are above 50°F (10°C). If it's colder than 50°F (lO"C), drive the vehicle in DRIVE (D) until the engine temperature gage moves and then remains steady 10 minutes. Then for follow the hot check procedures. 6-21