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Old 11-28-2007, 03:21 AM
toomany MBZ's Avatar
toomany MBZ toomany MBZ is offline
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Join Date: Nov 2006
Location: central Va
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Not sure of a '91, but the other two buttons are SUPPOSED to direct the fan to floor, dash etc. With the temp wheel in the heating degree range, the compressor will not come on, but is SUPPOSED to send heat. I also think they could have done a better job designing this system.
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