Double judder when decelerating

[JOHN5710]

Hi everyone Im a new member and looking forward to learning a few points which will help me keep my 2013 Berlingo going a bit longer !

I do have a problem that the garage seem lost on, and that is when I decelerate between 50-70 mph there is a double judder that appears to come from under the car, that funnily enough does not happen when the air con is activated. Does anyone have any ideas ?

I have a 2013 Berlingo Multispace XTR 1.6 HDI (B9) OSOBOWY (85 Kw / 115 HP)

[brodfather11]

engine , g/box or front suspension mountings ?

But I don't think the air con on or off would affect them

[JOHN5710]

Thank you for the reply, the car recently had a service and the mechanic said the mountings were good, but after I tried it and the double judder is there at 60 mph and above bot nothing when I engage the ac compressor it's weird.
I've had new ac compressor fitted to eliminate the fault but when I turn the ac off I get the double thud under the car.

[brodfather11]

I 've never heard of this before but someone who has had the same may be able to help.

Hope that the someone will be along soon.

[JOHN5710]

Thanks so much for the reply, it's an annoying fault as the car drives perfect with the AC on which in Spain is more on than off. However I really want to find the reason why this happens so it can be cured. I agree it feels "mounting" related but with the ac on the car decelerates normally it's only when it's off that I get like a double judder after a second or two when I take my foot off the accelerator, it's more prominent between 59 - 70 mph and less above 70.

01/08/2022
I have discovered that at low rpm and in second there is a judder (AC on or off), I am now wondering if the gearbox mounting is the culprit, any comments please would be very helpful

[Sol]

Could be the lower torque mount (dogbone) at the bottom rear of the engine.

[JOHN5710]

Hi thanks for the reply, that sounds worth a try, do you have a part number please?

[JOHN5710]

Could be the lower torque mount (dogbone) at the bottom rear of the engine.

Hi Zion, could you tell me what this part looks like and if possible a photo

[JOHN5710]

Could be the lower torque mount (dogbone) at the bottom rear of the engine.

Hi Zion I have enclosed a PDF of the engine mounts and circled the one I think you are referring to

[Sol]

Yeah that's the one I was thinking about. You can get powerflex inserts for it.