I have used gentle heat in the past on sagging headlinings to tighten them up. The danger in using a heat gun is that you can get too much heat onto the surface and it goes shiny.
In the case of your door cards I would first try covering with a damp towel and then ironing over the top with a very hot iron. The damp towel holds the temperature at a maximum of 100 deg C which is hot, but below the melt point of the the vinyl plastic. Just be careful you don't actual crease the covering before it shrinks back & keep the towel damp at all times. You could try a heat gun on a small patch on the back of the door card where it won't be seen if it goes wrong!
Roger
_________________ 1975 Sprint Man O/D in Honeysuckle Yellow
1971 Stag Auto White
Too many cars, too little time!
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