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3 prong
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    Ok -- so i've been digging through google and the forums and everything I can find states that the 3prong pack is for ATC and the 7prong pack is for manual HVAC controls. 3prong - http://imgur.com/OjRTP 7prong - http://imgur.com/WI6rO However, autozone, oreilies, and Chevy itself tell me the...
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