Vent Door

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Doubletop

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May 25, 2020
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Location
Muncie, IN
First Name
Doug
Truck Year
1987
Truck Model
Sierra 1500
Engine Size
305
Can anyone advise what control setting is supposed to open the door at the bottom passenger kickpanel on a 87 GMC? It doesn't seem to open on any setting. I have A/C, but it is currently inoperable.
 

75gmck25

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Location
Northern Virginia
First Name
Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
That lower door will open when the A/C is on the max or recirculate setting. It also closes off the cowl intake (outside under the windshield) to about 80% so you get a small amount of outside air, but mostly inside air recirculating.

Do you have vacuum to your HVAC controls so that it switches between floor, vent and windshield?
 

Doubletop

Junior Member
Joined
May 25, 2020
Posts
21
Reaction score
6
Location
Muncie, IN
First Name
Doug
Truck Year
1987
Truck Model
Sierra 1500
Engine Size
305
Yes, it switches between floor, vent, and defrost. Just haven't gotten to start on A/C yet. Thanks for the response
 

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