I understand the info system is not installed. May trigger some alarm malfunctions and may affect the sunroof, central lock, etc. May also get an SRS message once the info is installed back. Not sure how it would be related to the A/C unless it also gets the climate control module (CCM) confused. One thing when disconnecting-connecting the battery is to have the key in ingnition POS II to have the headlights on. If not, sometimes the power surge from the battery can blow the small thermistor behind the little grid on the CCM and render the CCM more or less inoperative.
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