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96 Cadillac Deville AC Problem.........Troubleshooting

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I have 96 cadillac deville, and its displaying an error message "Service AC System/AC Compressor OFF. WHen I turn on the AC, you can hear it blowing but nothing comes through the vents. When I cut the HEAT on it blows but not thru the front vents, but it actually gets hot. What could cause this problem????/

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The system is low on refrigerant - that is why it is setting the codes/turning on the "Service AC system" message. Does air flow out the defroster grill while the A/C is turned on? If so, there is a vacuum leak somewhere in the control system.

'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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