My 2010 Ford Focus zetec 1.6 Diesel Tdci sounds like it's hissing when it's cold. Once it's up to temp dissapears. I've only had the car a few weeks so is all new to me(cars in general).

The car drives fine apart from some kangaroo hopping in 2nd gear and pulling to the left(that will be for another post).

I have a video of the noise on youtube here: Ford Focus Noise Youtube

Any advice appreciated, it may be perfectly normal for a diesel engine but the only diesel engines I'm used to have been on fork trucks.


1 Answer 1


That sounds like a squeaking ancillary belt (fan belt) to me. This belt drives things like the alternator. May just need adjusting, but may need replacing.

Sometimes the noise changes when you add electrical load to the alternator by turning the lights on and the window demister etc.

  • Is it normal for it to go once warmed up?
    – DamoC
    Oct 20, 2020 at 17:01
  • Yes, as the rubber belt warms up, the rubber can become more sticky, so it grips better and the noise goes away.
    – HandyHowie
    Oct 20, 2020 at 19:34
  • Makes sense, so bit like valve or timing chain noise(I'm used to bike engines). I'll check that belt out thanks!
    – DamoC
    Oct 22, 2020 at 15:22

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