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A/C only blows one side

(1990 Chevrolet S10 Blazer)
in Muskogee, OK on June 12, 2011
I have a 1989 Chevy S10 blazer. When I turn on the A/C, no air blows out the passenger side vent and the right vent in the middle of the dash. Waht is causing this? Thanks.
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Most likely a blend door not being operated correctly, the heater controls need to be tested. Autozone have some popular workshop manuals for free on line once you register (for free) on their website There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
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on July 17, 2011
Thanks. After reading this, I had it checked out and that was the problem (blend doors). Thanks again.
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