I overheated badly the other night, due to just buying the car and not knowing it was devoid of coolant. No warning bells went off, so I was flying down the highway when smoke started coming out of the engine, and it clattered when I accelerated. I noticed the temp gauge in the red, and pulled over. It smoked for a while (not badly) and I came back for it later. I filled it full of coolant, directly into the radiator (it took about 14 liters) and replaced the radiator cap with a new one, just in case. It's still overheating - the temperature jumps up into the red within 10 miles, but there's no noises or other indicators that there's a problem. It drips a small amount of coolant when parked, but not enough to be a serious drain. Any suggestions?
If it was me I would try changing the thermostat first because if you get it that hot the thermostat came fail and its cheaper than a head gasket and to know if it is your head gasket or block see if there is any water in your oil or any oil in your coolant
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If the system is loosing coolant, it has be leaking from some place, either from a connection, gasket or out of the tail pipe. When you refilled the cooling system, did you start the engine and inspect the vehicle while it was running and at operating temp?
Have system pressure tested when cold and full to top. Pressure test will force coolant out and you will be able to trace the leaks location. Hopefully it's a small hose leak and not a major problem like a blown head gasket or cracked head.
in the 5.2L V8 engine the coolant sensor is located on top of the engine. Locate the coolant thick hose coming from top of the ratiator to the top of the engine. Look at the place such hose connects to the engine you wont miss the sensor it is about one inch from there.
Any smoke coming from your tailpipe? Could be a blown head gasket and is allowing coolant to seep from your jackets(passages) to your combustion chambers. How about strange odor in your exhaust? Does your fan kick on when at normal operating temperature? How quickly does it use coolant?
Did you check the coolant level...NEVER OPEN WHEN HOT!...check the resovoir as well...it will have a fill line on the side. If all that looks ok...it could be a stciking thermostat, bad water pump, clogged radiator, and/or bad cooling fan. Are you losing water? Do you see water below the vehicle? Do you see steam. DO NOT RUN THIS VEHICLE HOT...YOU CAN DO THOUSANDS OF DOLLARS IN DAMAGE. These 5.2 liter engines are very tough so fix this soon ...it should last you a long time as long as you do not overheat it badly. You can have a garage check it out and I reccoment this quickly if it will make it that far without overheating. Tow it if you need too...it may cost to tow it, but it may cost you more to drive it in. Good Luck ! : )
Your Jeep should have a 192 or 195 degree thermostat. Do u have to add coolant once in a while? If there is no coolant loss, no overheating problem, u shouldn't have to worry about it, it could be the temp. sending unit is not accurate. If it concerns u it would probably be worth it to remove the thermostat, check the temp rating on it(it should be stamped on it). Replace w/ a new one, and see what it indicates for temp then. Good luck, let me know what u find Curt