(Modern motorcar)
(Vintage motorcar)
I tend to be fascinated all the way by words like 'motorcar'. Those words seem quaint and suggest certain historically technological or scientific progresses. For instance, the 'motor' in 'motorcar' tends to hint that motor for vehicles was a fancy thing, when the word was coined. 'Motorist' is also interesting in that sense. Some other English words approximate to "motorcar". One nice example would be 'motorbike'.
Don't you think the current word 'car' to be a little curt, comparing with 'motorcar'? :-)
On a different note, in American English, people don't regard the word 'car' coolly in their minds. They have certain emotional attachment to it. It indicates 'liberty', 'freedom', 'mobility' and so on, to my knowledge.