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mode not switching
I have a 2003 gmc sierra 2500 hd with manual control dual
climate heater that wont switch modes - hot air comes out of
middle height vents only . Any normal problems with this
system ? I suspect the switch , but just wanted to know of
any common repairs . 
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| Engine | 6.0 L |
| Trans | 5-speed Automatic (Electronic) |
Vehicle Data
2003 GMC Sierra 2500 HD SLE 6.0L
| Engine | 6.0 L |
| Trans | 5-speed Automatic (Electronic) |
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