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My experience has been causes for over heating was.
leak and low coolant, fan not running if you have 2 fans one come on when A/C is turned on the other comes on when engine reaches operating temp. I have had thermostat stuck closed, radiator cap not sealing, fan fuse or relay, temp sensor not working temp sensor could keep your fan from coming on, I have also had to change a couple radiator but it was due to leak. I have heard of some where radiator was blocked up, I think those were issues of stop leak was used for many years.
How are you determining that it's over heating ? Temp. Gauge ? Do the cooling fans turn on ? 5 different mechanics ? Did any of them hook up a scan tool , to see what the coolant temp is . Use a inferred temp tool to see what it shows for temp.
Hi, heard this a few times. First make sure you fans are coming on if there electrical. If they are electrical, by turning on your air conditioner usually turns on your fans automatically. There is a sensor/coolant temp sensor that tells the fans when to turn on and off by sensing the temp of the water in your radiator. some are located on the radiator. Unplug the sensor and unscrew it. Put the new one in and tighten it down put the plug back on and if that was the problem you should be good to go. PS could also be right by the large hose at the top of your radiator where it goes into the motor. either way when you remove the sensor make sure the engine is cool and the anti freeze is going to leak out so move quick.
Check the temp sensor on side of radiator. It's a large brass fitting with a couple of wires coming from it. To test, get car/truck up to normal operating temp and turn AC on. AC usually triggers fan to come on. Others try bypassing sensor with leads or leads to fan directly from battery but you "chance" damaging fan. The part is called "aux fan sensor"
PCM is probably not getting a signal from the temp sensor, so it's kicking the fans on just in case. Check connector on sensor. If connector is OK, replace sensor. The sensor is mounted on the thermostat housing near the end of the upper radiator hose. See picks of a couple engine examples below. The part is only $11 at autozone.com, and a pic is pasted below. Let me know if you have any questions.
Check the temp sensor in the radiator. It should be on the side with a couple wires coming to it. You can test it for power and then you can short it to see if the fans come on. If they come on then you can test the sensor by warming up the car with a continuity checker attached to the sensor to see if it closes or not.
More than likely the fan switch in the radiator has failed or the fan itself has failed / is not running, so the water returning from the radiator to the engine is HOT therefore you are seeing the high coolant temp input indication. Check out the operation of your radiator fan.
If the fan circuit is OK then the water temp thermostat may very well be be stuck closed.
I think you started out looking in the right places. Replacing the coolant, thermostat, relay and sensor are all fairly inexpensive.
I believe you either have blockage in the system (especially if you're using tapwater), or your water pump may be failing.
I would first either take it to a radiator shop and have them flush the cooling system out thoroughly, or else pick up a chemical flush kit and do it yourself. This involves more than just drain and refill.
If this doesn't work, your next step will probably be replacing the water pump. At almost 200k miles, it's probably about due anyway.
It is most likely the temp sensor. you can test sensor and all wires with an ohmmeter. On the ohm setting, place one probe on one end of wiring or sensor, and the other on the other end and there should be a reading.
thanks for the help. will look tomorrow.
near the thermostat in the housing.
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