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There are 4 or more. Which do you want to replace? The coolant temp sensor for the dash? The coolant temp sensor for the ECU? The temp sensor for the outside temp reading? The temp sensor for the fans to turn on? Temp sensor for the AC?
You would need a scanner and an inferred temp sensor to troubleshoot the system. You need to know what the actual engine temp is, and what the temp sensor is telling the computer. If and when the engine reaches 220 degrees, the engine temp sensor should be sending that data to the computer and it should ground the fan relay to activate it. Unplugging the sensor and having the fan run tells you the sensor is connected, and there should have been a trouble code set at that time. It is possible the coolant level is low, or something else preventing the temp sensor sending the correct data.
This sounds like a bad coolant temp sensor that give computer false reading, check the coolant temp sensor connector and if it is good with no bad wires to connector then replace coolant temp sensor , when the computer gets a signal from temp sensor that engine is hot it turns fans on high speed to cool radiator and displays a/c turned off , if this truck does not have electric cooling fans then they wont run just explaining what happens depending on engine and cooling set up. replace coolant temp sensor and check connector.
There will two type of sensor, both are located on the upper thermostat housing, one is a sending unit, the other is temp sensor,if you pull one sensor and the temp gauge suddenly drop that is your temp sending unit.If you pull the other one and the vehicle kicks a high idle on and check engine light appears then you have the temp sensor
If that's the case, I strongly suggest that you replace the coolant temp sensor. Looks like it's faulty and grounding the circuit. The car's computer can detect it that's why it won't start but once you disconnect it, it will for the coolant sensor is bypassed.
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Coolant temp sensors do occasionally die - it's probably time you replaced it. It's only a $20 part so I'd try replacing it first. If you keep getting the problem, then you need to worry about your wiring harness or ECM.
The temp sensor itself can be replaced with an OEM sensor from your local auto store. Then it's just a matter of replacing the existing sensor on your block, plugging it into the connector and hoping everything works better.
I'd recommend doing this ASAP because a problem with the temp sensor can confuse the ECM into enriching the air/fuel ratio and retarding the spark. This can lead to misfiring and can really mess up your catalytic converter if you keep allowing it to happen. Definitely cheaper to fix it early!
this does not mean the sensor is defective, it most likely means the engine thermostat is stuck open and the engine is not running hot enough to satisfy the computers preset temp requirements for minimum eng operating temp.
Are you mistaking the engine temp sensor for the engine temp sending unit? The temp sensor is for the fuel injection system and the temp sending unit is for the gauge. If you asked for a sensor thats what they sold you. You need to ask for a sending unit.
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