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Home » Public Forums » GMCnet » [GMCnet] 78 dash heat/A/C. How does it get outside air?
[GMCnet] 78 dash heat/A/C. How does it get outside air? [message #332884] Thu, 31 May 2018 20:51 Go to previous message
BobDunahugh is currently offline  BobDunahugh   United States
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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Senior Member
Trying to figure out where outside air gets into the heat A/C box. Openings at the back of the box go into the coach. The opening on top of the box go to the defrosters. There are no openings in the left, right, bottom, or front. Remember that this box is used only on 77, and 78 GMC's. Have photos if interested. Bob Dunahugh 78 Royale
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