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Re: 2003 with Dual Air, NO cool air in the rear
Not a cut and dry deal.
Try pulling the RDO/bat. fuse this will reset things.
IF not I'd suspect its a bad actuator.
My 2004 suburban did this a few times but the reset fixed it.
Mine recently blew luke warm air only up front and it was intermittant, replacing the ac control module fixed it.
Auto climate can be a pain.
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