Vent fails during warm weather

H

hot2moli

Vehicle: '90 Legacy

So my environmental controls aren't broken to their full extent. When the
weather is at -20 F my A/C/Vent/Heat/DEF-Heat (NOTE: basic DEF does not
work) work without a catch. However, if the tempature gets to around 65 F
(give 'er take) the whole ventalation system turns off. Origionally a
quick pop to the dash would turn it back on (yeah...i'm quite the
engineer). Now it is just temperature dependent and 100 F without A/C is
killing me.

I've tried all the combinations of fan speeds to buttons, but all is for
not. Any suggestions to the problem or further troubleshooting?
 

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