I have a skoda fabia mk1 55 plate 1.2htp, it has been fine for years as a daily runabout but today the radiator fan came on, but never shut off at all even once cooled down a bit still going, temp gauge in car read 90° constant so not overheating at all but fan just wouldn't go off.

In the end I disconnected battery so as not to drain it, I then found the temp sensor near airbox and removed it was very brownish red as brass goes, so I cleaned up with 0000 steel wool and is shiny brass again, cleaned the pins and connector plug and reinstalled, top up water to level and started it up and let idle it took a while but fan came on after some time like it used to then I turned engine off, fan continued for approx 8 or 9 minutes then cut off is it fixed or is something I missed ?

Any help much appreciated

Does this car have air conditioning?

1 hour ago, Breezy_Pete said:

Does this car have air conditioning?

Yes it does have ac

In that case it has a fan control module hanging off the nearside chassis leg, close to where the bottom hose attaches to the radiator.

Your symptoms suggest that a relay within this is sometimes sticking on instead of clicking on and off according to radiator thermoswitch control input.

You could prove that this is what's happening by disconnecting the smaller of the two plugs going to it while the fan is running. If fan keeps running, module is faulty.

Access isn't super easy though, much better from below with undertray removed.

There's a fuse you could remove to demonstrate the same thing, one of the blade fuses in the battery fuseholder. I'll try to find which one.

Those blade fuses hide under a plastic cover, to the right of the strip fuses as you look from in front of car.

One of the 5 amp ones, from memory.

Fuse 9 or 11 on battery fuseholder, depending on exact build date. The 5 Amp blade fuse with a thin red/violet wire coming off it. Try removing that the next time you see unexpected fan running.

Edited 18 March18 Mar by Breezy_Pete