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Re: checking computer says engine coolant temp too low
The stat is in the upper rad hose follow the upper hose to the mtr the hose goes to the themostat housing there are two bolts holding it on look to the left of the housing you will see a sensor that is screwed into the intake manifold when you remove that sensor coolant will run out
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... A faulty coolant sensor that always reads cold may cause the fuel control system to run rich, it may be sending the wrong info to the computer and the guage. make sure there is no air in the coolant system, and it is full. see if coolant resorvoir is full when hot. if all is ok, change coolant sensor. good-day!
The Engine Temp. sensor is bad. it is under the intake manifold. if there is a miss also check under the coils over the spark plugs. If there is Coolant in the spark plug holes .then the intake gasket is leaking. The intake manifold needs to come off to change the coolant sensor. When off look for corrosion on the cylinder head at the coolant port. If there is corrsion then the cylinder head must be replaced.
The code is telling you the engine temp sensor is telling the computer the engine is not warming up as it should. Sometimes the problem is the thermostat, or low coolant, and sometimes it is the temp sensor. Check the engine temp with an inferred thermometer first. Usually the engine temp sensor is a two wire sensor, yellow and black.
The first step is to determine whether the engine is actually running cold or if the engine computer just "thinks" it is. Your temperature gauge is controlled by the engine computer. I use an infrared thermometer directed at the base of the Engine Coolant Temp (ECT) sensor while watching the ECT sensor data on the computer to see if they match. This should be done before replacing ANY parts. You need to make sure that the ECT is not "lying" to your engine computer. Your vehicle is also equipped with a Cylinder Head Temperature (CHT) sensor to measure the the temperature at the cylinder head. (The ECT is located in the intake manifold.) These should read within 5 or 6 degrees from each other at all times. If it is determined that the sensors are all functioning properly, and the engine actually is running cold, then I would recommend getting a thermostat from the dealer. (I have had a few problems with aftermarket thermostats.)
What your describing is either a sticking thermostat, a low coolant condition or a blown cylinder head gasket.The code is for coolant temp fault.Not always the temp sensor but it is located next to the thermostat housing.
The fans are turned on by the PCM, if the PCM is not telling the fans to turn on, they won't even if everything tests fine.
2005 Chrysler 300 V8-5.7L VIN H
Coolant Temperature Sensor/Switch (For Computer): Service and Repair ENGINE COOLANT TEMP SENSOR REMOVAL The Engine Coolant Temperature (ECT) sensor (3) on the 5.7L engine is located under the air conditioning compressor. It is installed into a water jacket at the front of the cylinder block. WARNING: HOT, PRESSURIZED COOLANT CAN CAUSE INJURY BY SCALDING. COOLING SYSTEM MUST BE PARTIALLY DRAINED BEFORE REMOVING THE COOLANT TEMPERATURE SENSOR. 1. Partially drain the cooling system. 2. Remove accessory drive belt. 3. Carefully unbolt air conditioning compressor from front of engine. Do not disconnect any A/C hoses from compressor. Temporarily support compressor to gain access to ECT sensor (3). 4. Disconnect electrical connector (2) from sensor (3). 5. Remove sensor (3) from cylinder block. INSTALLATION 1. Apply thread sealant to sensor threads. 2. Install ECT sensor (3) to engine. 3. Tighten sensor to 11 Nm (97.3 inch lbs.) torque. 4. Connect electrical connector (2) to ECT sensor (3). 5. Fill the cooling system.
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.
That code represents a lower than expected reading for temperature (coolant). First thing to do is check your coolant level, as if it is low, then the sensor can not read correctly. Second, you may have a thermostat that is stuck open, allowing the coolant to cool off too much. The sensor should be mounted on top of the engine, near the thermostat housing.