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heat coming out a/c vents
We have a customer that has a 06 GMC 1500 truck with a
manual a/c heat system. Some times, not always when he has
the a/c on heat starts coming out of the 2 left dash
[...] other vents work ok. Scan tool shows B0408 code
left air mix control circuit. 
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| Engine | 4.3 L |
| Trans | 5-speed Standard |
Vehicle Data
2006 GMC Sierra 1500 SL 4.3L
| Engine | 4.3 L |
| Trans | 5-speed Standard |
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