What could be causing front panels to not blow air just the one to def

Chevy Astro Van Cooling System Diagram

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ASTRO 2WD - Hoses & pipes/heater > Chevrolet EPC Online > Nemiga.com

Chevy astro q&a: engine removal, steering diagram, cooling system

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AstroSafari.com • not really engine- ID question
AstroSafari.com • not really engine- ID question

Cooling System for 1999 Chevrolet Astro | GM Wholesale Direct
Cooling System for 1999 Chevrolet Astro | GM Wholesale Direct

What causes a problem with my ac & heat in my 2003 Chevy astro
What causes a problem with my ac & heat in my 2003 Chevy astro

I have a new to me 1999 Chevy Astro van. The blower works but air only
I have a new to me 1999 Chevy Astro van. The blower works but air only

ASTRO 2WD - Hoses & pipes/heater > Chevrolet EPC Online > Nemiga.com
ASTRO 2WD - Hoses & pipes/heater > Chevrolet EPC Online > Nemiga.com

Chevy Astro Q&A: Engine Removal, Steering Diagram, Cooling System
Chevy Astro Q&A: Engine Removal, Steering Diagram, Cooling System

What could be causing front panels to not blow air just the one to def
What could be causing front panels to not blow air just the one to def