Well, for cooling coil, i didnt observe it so couldnt tell you in details but one of my close friend got that issue and the symptom was very clear that he lost complete cooling of his car just in one or two days...checked by the dealer and been told that its coil has gone....replaced it in warranty.
Regarding steering rack problem different people are observing different symptoms, some people getting noise in turning their steering while driving, some getting it in idling etc etc but the core thing is NOISE from the steering....i personally have got this issue and my warranty has been claimed...waiting for the part to arrive which is still 5 days behind the official time of 14 days...