whats the worst mistakes u can make when installing a raditor on 2000 Dodge Grand Caravan

got my raditor hook up i didn't get coolant after that but i did hear some noise coming from around the back center of the van in a leak near the front end of my passenger side 1 time the color was light red

Asked by for the 2000 Dodge Grand Caravan
you could punch a hole in coils
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Trans cooler line not sealed possibly?
ok thanks