i have a2007 mercury grand marquis and when I drive the a/c blows out the defroster instead of the vents

Asked by Jul 20, 2011 at 08:06 PM about the 2007 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

2 Answers

1,695

if your selector switch is in the correct position for vent/dash divert and it blows out the windshield only then its a electrical diverter door or switch control that is not working, if it blows out the vent/dash but then switches to the windshield when your driving its a vacuum leak to one of your hoses under the dash which are extremely hard to locate not recommended for a novice, seek a mechanic for this preferably your Ford dealer.

4 of 4 people found this helpful.
500

The EATC module is at fault. These can be repaired or replaced on eBay pretty cheap. The guy who did mine was eatc-man on ebay. He has a store Ford EATC and more on eBay as well. He offers both repair and replacement. Here is the link http://stores.ebay.com/Ford-EATC-and-more.

3 of 3 people found this helpful.

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