So by increasing the cost of Chinese Auto Goods, you increase their demand... hmmm....
Perhaps we have finally found a Giffen good?!?!?
Ok, facetiousness aside, I don�t buy that argument:
Your first part is correct: "If getting parts from China is getting more expensive, and so assembling cars in the US is getting more expensive".
But:
1) If we assume that Chinese Auto parts only make up 10% of the cost of the car, and the currency strengthens by 10%, then the cost of the US-built car will increase by 1%.
3) If the whole car is built in China and sold to a US consumer then the cost has gone up by 10%.
So your conclusion that "it starts to make more sense to push more of the car assembly into low-wage countries like China" doesn't make sense to me based on currency movements alone. Infact quite the opposite.