Foggy windows, help! can't see anything

[Nik B]

I've been having this problem for quite some time now on the 89 100, all of 
the sudden when it starts to rain or even in cooler weather the friggin 
windows start to fog like crazy.  I then commence to turn on the defog, but 
even that doesn't make too much of an impact.  I did the heater core about 8 
months ago, there are no leaks in the car and there is no sign of moisture 
getting in anywhere.  Although I have not checked the spring on the 
re-circulation flap, I was just wondering if that spring is a common 
culprit.

Thanks
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