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Don't know for sure but my thought should be cheep to check out. I am thinking. I have had cars where electrical parts got over heated and stopped working. Had a car coil would get overheated and shut the car down. Had a car recently which the fan relay would over heat and the fan would quit working. After the relay cooled down the fan would work till the relay heated up again. I changed the relay and solved my problem.
My thought is if it run and stops running check the temp of your relays. for example if the fuel pump relay is a lot hotter than the other relays it might. be bad. When it shuts down just check the temp on you relays and see if any of them are a lot hotter than the others.
It shouldn't really cost anything as long as you can get out of the car and do it in a safe location.
Hi Justin, A problem with the cylinder head almost always results in overheating, not running below operation temperature. I think you hit the nail on the head with your diagnosis of a defective (or missing) thermostat. Regards John
With the car running because it reduces the back pressure have someone that knows how to do it remove the cap from the radiator and see if the radiator is full, not the bottle but the radiator itself. If the antifreeze is not moving from the bottle to the radiator it will overheat. Not having heat unless you rev the engine makes me think the radiator is either not circulating the water or it is low.
Engine quickly overheating is often caused by a stuck closed thermostat. However, in your case since the fans don't come on, the most likely culprit is a bad fan speed controller. These are variable speed fans controlled by the speed controller. They fail when rust forms on the mounting/cooling area where the controller is mounted. This is an electronic device that has a heatsink on the back. When rust forms it can't dissipate heat and that burns out the controller. See the post below for more information on how to replace it. Car overheats Chrysler Vehicles Ricks Free Auto Repair Advice
In the high current fuse box which is located in the engine compartment. It is a 60 amp fuse and should be marked as fan. In the middle row, second from bottom close to the diagonal cut.
the thermostates on the 3400 engines are late because the fans kick in at the last moment. if you run your ac on you will notice that the gauge stays in front of the half mark or right on the half mark. that is because when you turn on your ac your fans will kick in earlier and stay on the whole time the ac is on. if you run your car with the heat on or nothing on that leaves the late thermostate to kick in verus you turning on your ac and it by passes the thermostates and runs the fans once the engine gets at at lest 120 deg. i use to have a 2002 and i had the same problem. this will keep your engine cooler. also if you don't want your air on just turn on your windshield defrosters (not the back windshield) and that helps keep your engine cool because your defrosters use your air compressor which is really your ac. so it still kicks the fans on earlier.
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