ACF

Hi Paul. The gauge appears to work normally, starts off low and then climbs to just below mid range after driving a short while.

hi paul h, I was just wondering if the sensor does the job for the temperature gauge, cooling fan and engine ecu then why is it faulty for the fan but the temperature gauge is working normally? thanks.

Thanks again paul h. I'm based just outside Belfast in County Antrim, don't know if any other forum members in this area. I think I've located the sensor. The sensor is probably changes resistance as the temperature changes unless it's a thermocouple in which case there will be a change in voltage from it. I have an electronics background so I was hoping to simulate the sensor. Do you know which type it is and do you know the range of the device (it should either be in ohms or in millivolts). Failing this I'll probably buy a replacement sensor.

Thanks paul h for your post. The aircon is already off, it's very seldom turned on as it has never worked that well. My C5 is the 2008 - 2013 model, not the previous model. Do you know where the sensor on newer model is located and does the same thing about getting a new sensor and plugging it in still apply as the best way to see what the problem is? Thanks.

Hi, I have a 2008 C5 1.6HDI. I went on a one week holiday a few weeks back and ever since I returned to pick my car up at the airport the electric cooling fan has been running. As soon as I put the key into the ignition the fan starts to run, I don't even have to turn the key. This is happening even first thing on frosty mornings. When I turn off the engine the fan runs on for about 30 seconds and then stops. Everything else on the car seems to be working fine. Has anyone any ideas what the problem is. I suspect a faulty temperature sensor but haven't a clue where this is located or how I can test it. Hope you can help. Thanks.