I've noticed a tendency for the windows in my cars to be more prone to condensation immediately after turning off the air con.
I put it down to a couple of things:
1. The windows are likely to be cooler than the ambient temperature and therefore more likely to condense water.
2. There will be some condensate around the condenser of the air con and this will add to the humidity of the incoming air which combined with 1. above could cause the problem.
I don't worry about it as whenever I park up for a short while when I've had the air con running I usually see a patch of water under the car which indicates the drains are free.
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