What does 停车期间热浸 mean?
this seems relevant （http://exa-china.com/key-off--soak.html）:


  其中一个最极端的恶劣工况叫做“停车”或者“热浸”，这是指汽车在发动机很热的情况下很快停车，因为没有了冷却气流，发动机舱内的零件温度会升高。(1)


I think you are getting this sentence here (http://chinabidding.mofcom.gov.cn/govmain.jhtml?method=detail&amp;channelId=205&amp;docid=223065243):


  测定由于昼夜温度波动、停车期间热浸和城内运转所产生的污染物 (2)


The correct translation for the concept in (1) should be "hot soak": http://esa21.kennesaw.edu/activities/smog-cars/doe-veh-pollutants.pdf

Hopefully (2) is the correct context.  In general it would be good to include at least the entire parent sentence, so we can help you.