If you feel there is any doubt with regards to the accuracy of temperature or pressure gauges on your factory dash indicators , it would be best to seek after market gauges that are considered more reliable and accurate . Last year someone I know lost an engine due to the dash low oil pressure indicator not coming on when apparently oil,pressure must have been low possibly due to a worn oil,pump as those engines were said to be known for. If an accurate oil pressure gauge were installed , at least he would have had some indication of the oil,pressure more accurately . That said , you'll want to take every precaution you can to,prevent breakdown and damage. While it is good to change trans fluid and filter , you'll want to be sure that the coolers lines are not clogged with oil residue from any burned oil that constricts flow. It is likely your jeep came factory with a trans cooler . You'll want to be sure that it is clear of any restriction as well. Any auxiliary fan that may be installed to cool this trans cooler should be checked if working properly . Many factory trans coolers are just a simple in line installation in conjunction with the radiator trans cooler with no auxiliary fan . Usually the factory electric fan is tasked with cooling the radiator which should cool the trans fluid as well . It would be best to at least find a temperature sensor and gauge that can be added for you to monitor like a analog coolant temp gauge than to,rely on a light . Light are good only to let you know AFTER the hot fluid condition has happened. By then , what damage that could occur has begun as well. At the minimum , please be sure that all lines and coolers are clear of restrictions to,allow full flow of fluids from trans to cooler and back to trans. This is of course very important to all vehicles but if certain transmissions are known to be chronic for running hot ( the 42RLE has a rep) then it is best to keep after such vehicles with these transmissions to be certain not only the fluid and filter is maintained but the lines and coolers be flushed for good flow and no restrictions. Sometimes a sensor may be congealed with residue and lead us to believe the fluid is overheated from normal hot and cold cycles summer and winter. This can possibly be a fault in your vehicle and others . Not suggesting to,go,out and buy one and change it but this is something to consider checking if this condition persists. The sensor will give an immaculate reading and the PCM or BCM (body control module ) may give a false reading or misinterpretation outside the perimeters of the trouble codes and give one that not necessarily correct. This is more occurring with warning lights. To sum up, make certain the fluid lines and in line coolers are clear of obstructions and flushed if necessary with every fluid/filter change. Yes it's more work , but a transmission is more money. Don't wait for a gauge to tell you something is wrong , preventive maintenance will keep your trans working cooler and live longer.
