Source For NOS Switch?

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75gmck25

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Northern Virginia
First Name
Bruce
Truck Year
1975
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K25 Camper Special TH350 NP203
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5.7
I think that's kind of unusual behavior, because IIRC its designed so that if the vacuum fails it will default to being in the combo heat/defrost position for air flow. However, its been a while since I've worked on mine, so maybe I'm wrong.

When you put it on defrost, where does the air come out?
 

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