Do you have the ext temp showing on your A/C display?
Is the temp reading off (ie 80* outside, display shows 50*)?
If so, the outside temp sensor has gone bad.
They're about $10 at the dealer and is located in front of the radiator, under the front bumber.
Easy fix, easy swap.
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Bobby
Died 5/1/08, resurrected 5/15/08
ASCD SD hood, 17" Bullitts, Overkill PCM, 3.4" Pulley, NGK TR55IX, K&N 9" cone filter, JimmyC D/P, U-bend removed, Flowmaster 40 series, Hooker big bore tips with resonators, S/B brake lines, drilled/slot rotors, GMPP handling kit, KYB struts, F&R strut supports, HID's, LED's, 2.5" Air Dam, red GTP overlays on custom badges, white rear insert.