an engine if running usually heats up, are you talking heat in car? need new thermostat
Fire Hazards!
There are several reasons a 2002 Jeep Liberty could overheat. Some possible reasons are low in coolant, a bad thermostat, or the head gasket went bad.
For some reasons.
Most diesel engines will have a 'glow' plug that gives of enough heat to help get the engine started. The heat generated from the first few revolutions together with the compression from the piston is enough to ensure the engine keeps running. Some modern diesel engines no longer require a glow plug.
Well if your jeep is overheating running the air conditioner can kick on the fan that cools the engine; (you want to check this) However, if the fan does not kick on then yes it can over heat the engine. If your engine is over heating, then the best thing to do is pull over and let it cool down; (you can destroy the whole engine for some that relatively costs little to fix) However, you can reduce the heat in the engine by turning the heat on your a/c control all the way hot and all the way high which can buy you some more time to get your car to a safe place to pull over or even home. WATCH YOUR TEMPERATURE GAGE. Hope this helps.
Check engine light will come on for various reasons. The o2 sensors could be one of them. If your belt breaks the light will come on and the engine will over heat. I mentioned the o2 sensor because when it comes on for this reason some people have had that light on for years without replacing the sensor.
Running your engine without a thermostat will cause it to run hot. An engine will run cooler initially without a thermostat. After that IT WILL NOT! Why you ask? Again, physics. An engine running without the restriction of the thermostat in the system (remember, even when it's wide open there's still some restriction in the system caused by the thermostat's small opening) will not keep the coolant in the radiator long enough for the radiator to 'radiate' the heat. That is, the coolant must stay in the radiator for a certain amount of time to dissipate some of the heat it has absorbed from being in the engine block. The coolant is in the block. It's hot. It moves to the radiator and gets rid of some of the heat. If it moves through the radiator too FAST, without the restriction of the thermostat body, it won't get rid of as much heat. Basic Thermodynamics at play.
when you turn the heat on it comes out of the motor compartment in to the car,, further cooling the engine. A good thing to know if your car is running hot: turn the inside heat on full blast to help cool it down some.
there are a number of reasons. some being engine has a lot of miles,a busted compresion ring,burnt valve,or even a blown head gasket. you need to find out if it`s one cyl. or all by running compression check on each cyl.
It varies from one car to another. Some recommend checking it with the engine off, some with the engine running in park, some with the engine running in neutral, etc. The owners manual for the vehicle will tell you how it should be done on yours.
You burn it for heat, which is then used to drive some type of heat engine to do work.
It has a lot to do with the fact that the heat provided when you turn the heater on comes from the engine. the faster your engine is reving the more heat you'll get. Next time try putting the car in neutral and revving the engine. that should get you some more heat.