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2003 Mercury Grand Marquis Question: Why does the A/C change modes, from panel to defrost all on it's own?

 

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spidermi8, Stuart, FL, November 27, 2012, 11:58
 Rookie

At idle A/C blows through the panel. As I roll down the road the A/C will start blowing out the defrost all on it's own. WHY?!?!?

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  • Answer #1

    Greg's Orange Auto (13020 Answers) , Orange, CA - (714) 361-9386
    globalhelper November 27, 2012, 12:47
     Master

    loss of vac to controller. ck vac lines under hood for cracks or breaks. if there ok ck under dash if unable to find have ssmoke test done to determine leaks

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