Possible causes. - Faulty Intake Air Temperature (IAT) sensor. - Dirty air filter. - Intake Air Temperature (IAT) sensor harness is open or shorted. - Intake Air Temperature (IAT) sensor circuit poor electrical connection. P0111 2008 Ford Fusion Description: Indicates the IAT rationality test has failed. Hi no i havent had the prob of the fan cooling fan starting up on cold when starting .so what im wondering is this started happening since you changed out the sensor in the head behind the aux drive pully .or did it do this before ,because what it sounds like to me is that the sensor is giving the signal back to the ecu to run the fans because when you last drove the mostor it was hot and when Ford Mondeo MK4 1.8 TDCI - Coolant sensor replacement 2008. Firstly I forgot to film an intro, lol. But here i Sacrifice a 15 mm deep socket to change the Coolant sensor on my MK4 Mondeo 11 posts · Joined 2012. #1 · Oct 17, 2012. Hello. my mondeo has developed a problem with the temp gauge its not working at first changed thermostate. now only comes on after about 20 miles slightly cant find the location of the water temp sensor to much. plastic any help would be welcome 2ltr tdci 130. Mondeo-Sender Assy Temperature Part Number: 6765706(QTY1) Retail Price: £21.58 You Pay: £19.42 Mondeo-ECT Sensor Part Number: 6810428(QTY1) Retail Price: £22.25 You Pay: £20.03 Are things just constantly zooming up in price or are these somehow different?! If you're watching this I'm guessing you've come across issues where your ambient temperature reading was showing 0°F or -40°F and your A/C air conditioning 4 posts · Joined 2015. #1 · May 18, 2015. Hello, I have Mondeo MKIV Duratec 2.0 2008, but I have problem with cooling fan. It does not start. I tried to find temperature sensor for this fan, but I have found only one sensor on thermostat housing. When I short-circuited it the gauge on dashboard go up. SOURCE: where is coolant temp sensor located on 2003 gmc. heres a diagram to show you where the coolant temp sensor is located, its behind the alternator on the left side (driverside),the sensor just unplug the connector and then unscrew it and out it comes. Posted on Jun 21, 2010. 760 posts · Joined 2012. #3 · Jul 17, 2016. On 175hp engine, the temp sensor is located in the throttle body - right above where the curved charge air hose connects to the body. There are two separate sensors in the t-body - the other is charge pressure sender. This is an older thread, you may not receive a response, and could be reviving an Found this explanation on E199 - The engine temperature gauge uses information supplied by the engine coolant temperature (ECT) or the cylinder head temperature (CHT) sensor, through the PCM on the CAN bus. If the temperature signal is missing or invalid, the instrument cluster will move the temperature gauge pointer to below the cold position. JK1ol.