Ford Repair Questions? Ask a Mechanic for Answers ASAP
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does the car still overheat???
how do you know it is not overheating??? the heat sensor is doing its job protecting the engine from damage and the gauge is verifying it is hot
is there any white smoke out the exhaust???
Hello, you replaced the cylinder head temperature sensor? How many miles are on the vehicle? Do you have good heat when you turn the heat on? Full of coolant no leaks? Can you post the 17 digit in number so I can check a few things?
Ok does the engine run long enough for it to reach normal operating temperature or does it shoot right up to overheat? No codes stored in the PCM? Do the heater hoses get hot?
Heater hoses hot should have heat, no codes stored in the pcm if checked for codes?
Either a shorted circuit for the cht sensor causing the gauge to raise be one thing but the lack of heat could be an issue with a blend door motor if the hoses are hot.AC will be disabled if engine is running hot according to gauge and cycle fans on
The PCM uses the Cylinder Head Temperature (CHT) sensor to measure the engine temperature. The Instrument Panel Cluster (IPC) receives the engine temperature data from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. The IPC monitors the engine temperature data received from the PCM and commands the temperature gauge indication with a corresponding movement of the pointer.
The non-hybrid and hybrid temperature gauges appear differently but essentially function the same. The non-hybrid gauge is an analog gauge with a needle that points to a specified area of the gauge depending on the data received from the PCM. The hybrid gauge is a digital display that appears as a thermometer. The fill color of the thermometer is blue when the temperature is between the cold and normal ranges. When the temperature indicates an overheating condition, the fill color turns to red.
Ok for one if you didnt know this vehicle has a branded title, meaning it has been probably in a major wreck and reassembled. Carfax can tell you more regarding that, there is a technical service bulletin im attaching mentioning corrosion inside the cht sensor connector and how to inspect& repair if needed.
Then with a new sensor installed and verifying the engine temperature isnt actually overheating. Since its a branded title, there is a possibility of a wiring issue with the vehicle. You should run your own wiring from the CHT sensor to the PCM to eliminate a wiring problem. If it still does the same thing bypassing the harness, it would be an issue with the Powertrain control module itself. If the engine is actually overheating as the temp gauge says it is and the cooling fans are working it is a possible issue with the water pump impeller damaged and not circulating water properly. Im thinking its more of an electrical issue. The blue wire is the signal return for the sensor pin 39 to the pcm. SInce the green wire to the sensor is supply power for other sensors and not flagging other codes I dont suspect that being an issue but you can jump from one of the other sensors to the green wire and return wire to the pcm to see if it changes operation.