Kjelltringen

Sorry about bumping this old post, but this problem just occured on my newly bought C5 2005 with the 1.8l. My solution was to change the temprature sensor that feeds the fan with coolant temprature. Measured it after removal and it was giving me faulty and slow readings. THe new one was quick to react and gave the fan some ease :) Im not an expert, but my guess is that the fan has a signal to run all the time. This is likely to prevent overheating. The only thing preventing the fan to run is the temp sensor and the signal is feeds. If it is fault then the wise thing to do is to let the fan run so you dont overheat :)