Try lubing the crap out of the latches with WD or the like and work them by
opening and closing the doors. Drivers door is the most likely. I am
assuming that van is like the Taurus (very common problem on that car) and
has the switches in the latch.
If you haven't already done so (or even if you have) really blast the back
hatch with WD40. The openings in the sides. That is almost for sure what is
going on. Yes the lights do give up after about 30 minutes even if it "thinks"
a door is open.
Also if your can of WD40 is old, get a new one. You want it to really foam up
when you spray it.
The best? I don't know.
The guy at the hardware store recommended it and it worked. I'm sure there's
probably something else, but I haven't had to pursue it.
I'm not any kind of expert. I just write about things that sound like things I
have dealt with.
That rear hatch is something I have sure dealt with...several times. It's not
a permanent fix, but it works for a year or three.
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