BerksEd

Rumbling/humming noise.

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So, my 2014 Fiesta has just come back from the garage. They can’t hear it at all, if it wasn’t for other family members experiencing the sound I’d swear I’m going a little crazy. 

I’ve had the car since January 2016 (with only 6k on the clock). Been a brilliant little motor but as of late has developed a low rumbling/humming noise at 40+mph. Most likely from the rear. We’ve (me, my brother and the garage) have ruled out wheel bearings. Garage suggested it could be the tyres but I’ve just had new ones of the back and then swapped with the front wheels. Sound is the same. Not front brakes as I’ve just fitted new upgrades pads and disks a few days ago. Been doing it for a while now (4 weeks) starting to get a bit concerned. Garage said they took the car up to 60 and couldn’t hear anything. Strange as it was doing it on the way to/from the garage.

Any suggestion greatly received. 

Also, the garage overfilled the coolant by an inch, should I be mega concerned?

Thanks!

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Update - so I’ve now had four new tyres on it, major service (where the garage says there’s nothing wrong with it) new front pads & discs. Still getting the rumbling noise over 40mph, very noticeable at 55-60. Been told not wheel bearings...

If anyone can offer any advice I would be very grateful. Concerned I am causing more damage to whatever it may be by driving it daily (no other option). 

Help!!!

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Have you had the opportunity to travel in a similar car to compare. These cars can suffer from general road noise. Does the noise vary depending on road surface. Does it disappear completely below 40mph. Have you tried sitting in the rear of the car and getting someone else to drive as sounds can be transmitted through the Shell weirdly. Have you confirmed it is 'road speed' related and not 'engine speed'. Can you 'feel' the noise through the steering wheel or pedals?

Good luck

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Are they the same make of tyres as the original?

The reason I ask is that I have just swapped cars from a Freelander - the original Tyres (Wranglers) were unbelievably noisy compared to the Scorpions I fitted - I'd heard about that but could not believe the difference until I experienced it myself.

If you haven't already done so try a different brand of tyre

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Hi, sorry, long reply..

I bought the car in 2016 (14 plate) with 6k on the clock, only started making the noise a little over a month ago, while it was still on the old tyres. Since the noise started I have put new tyres on all round, made no difference at all to the sound. I now have 30k on it and have made many long journeys in it (Berkshire to Leeds every three months plus a recent trip to Holland) never had any problems with noise. 

Seems to start at 40, very prominent at 55-60 and tails off when you drop below 35. Haven’t driven it at faster than 60 through fear of damaging something. Have held the clutch in while driving for a moment in each gear to see if engine revs drop off, which they do. 

Have been out in the car several times with my brother, changed driver, sat in back etc, he swears it’s coming from the front, but I’m useless at pinpointing noise in a car.. My gut reaction is wheel bearings (I’ve had them go on Fords before) but the garage, the tyre shop and my own brother (who is mechanically minded) don’t think it’s the wheel bearings. In the case of the garage, they couldn’t even hear any noise at all. But I’m not sure they took it fast enough as all the local roads are 30s plus they were rather incompetent anyway (did the wrong service on my car...the much more expensive one that I didn’t ask for and wasn’t due).

I have noticed some vibration in the accelerator pedal, but then that makes no sense cos as far as I’m aware it’s drive by wire. No difference in feeling to clutch, and brakes bare perfect since changing the discs and pads - like the tyres, after the sound started. 

If it wasn’t for the fact that some mates, my brother & my dad can hear it, I’d swear I’m going mad.

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