I am new to the forum and jeep world. I just got a 1992 Jeep Wrangler YJ 2.5L. When i was driving home after picking it up all the guages worked good. The drive is about 45 min. About 15 minutes from my house the temperature started to rise i turned on the heat in the jeep and it keep going back in forth. By time I got home and parked the jeep the needle was right above 260. The jeep didn't overheat.
I have searched the forum and read over a couple of items to replace. I have replaced the thermostat and the temp sensor. when I start it up and it starts to get warm the temp guage automatically goes to about 250. I am not sure what to check next.