I am facing this problem for the past 6 months (Winter as well as Summer).
During normal driving, in city or on highway the Engine temp is quite alright. However, during traffic jams or excessive STOP & GO situations, the Engine heats up. The needle on the temp indicator goes upto Max. I have to take the car off-road, switch-off the engine for 20 mins and hope for the traffic jam to clear.
What could be the problem? Any solutions?