1993 GMC Suburban Owner's Manual - Page 284

To gettherightreading,thefluidmust be atnormaloperatingtemperature, s which i 180°F to 200°F (82°C to 93°C). To check the transmission fluid hot: Getthevehiclewarmedupbydriving 50°F (10°C). I f about 15 miles (24 km)whenoutsidetemperaturesareabove it'scolderthan 50°F (IO'C), drivethevehicle in B (3rd gear)untiltheengine temperaturegagemovesandthenremainssteadyfor ten minutes.Then followthehotcheckprocedures. To check transmission fluid cold: A cold checkismadeafterthevehicle is used only has been sitting for eighthoursormorewiththeengineoffand if outside asareference.Lettheenginerunatidleforfiveminutes temperaturesare 50°F (IO'C) ormore. If it's colderthan 50°F (1O"C), you may have to idletheenginelonger. A hotcheckmustfollowwhenfluid is addedduringa cold check. To check the fluid hot or cold: 8 Parkyourvehicleonalevelplace. Placetheshiftlever in B (Park)withtheparkingbrakeapplied. 8 Withyourfootonthebrakepedal,movetheshiftleverthrougheach gearrange,pausing for aboutthreesecondsineachrange.Then, position theshiftlever in P (Park). 0 Let theenginerunatidleforthreeminutesormore. Then, w~thsut chufthg off th@engine, fokw./ these steps: 1. Flipthehandleupandthenpulloutthedipstickandwipe clean raaor papertowel. it witha , .. . . ... ._.i 1 .,... ... PO229 2. Push it back in allthe way, waitthreeseconds and then pull it backout again. 6-1 8