Jenie, good luck with customer service.
If you do have a chance, it would be useful to know which engine mount got replaced.
Also, what is the build date of your car? Ford changed the passenger side mount on 2/25/2013, and the center rear mount on 9/8/2013 (sounds like the start of the 2014 model year production). Looks like the revised parts are being used through 2016 models - so maybe a potential problem with both those mounts in early production.
I have just read various on-line discussions of Focus mounts failing and transmitting vibrations, as well as discussions of Focus enthusiasts who replace the stock hydraulic mounts with solid ones so the transmission moves less when accelerating, enabling quicker manual gearbox shifts (trade-off: more drivetrain noise in passenger compartment).
The upshot of the discussions (for me) was to re-enforce the thought that different mounts might well make a difference to powertrain noise in the C-max.
My car was fine yesterday; temps in low 20s. Under moderate engine load I could feel vibration through the steering wheel, but no disturbing noises.
Fine today with lower temps (17).
Anyone who is interested can see the 3 C-max powertrain mounts here (a dealer that sells discounted parts):
The lower mount shows two parts, a small link and a bracket -- I think it mounts to the suspension cross-member, possibly transmitting vibration to the floor pans. The other two bigger mounts carry the weight of the powertrain, and bolt to the frame high-up near where the top of the front shocks mount.
Edited by djc, 31 December 2015 - 02:48 PM.