need to know what activates switched ground on ac relay on 2005 ford freestar

2005 FORD FREESTAR
130,000 MILES
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GRANDPA JOHN
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ac clutch not engageing
Mar 23, 2012 at 4:08 PM
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SATURNTECH9
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Before you go checking the relay have you checked to make sure the a/c system isnt low on charge and the pressure is within what it should be to allow the compressor to turn on?
Mar 23, 2012 at 4:13 PM