Question about 1995 Ford F350

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AC blows out of the defrost vents until you accelerate for awhile and sometimes when you stop at a red light it will change from the ac vents and go back to the defrost vents

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SOUNDS LIKE A VACUUM PROBLEM ...CHECK THEVACUUM RESERVOIRS FOR LEAKS ,,CRACKS ETC ,, USE A HAND OPERATED VACUUM PUMP AND PLUG THE OTHER PORTSTO SEE IF IT HOLDS VACUUM. ALSO CHECK THE PLASTIC VACUUM LINE THAT SUPPLIES THE A/C CONTROLL SWITCH . THERE SHOULD BE A CLEAR 2 HOSE CONNECTOR BELOW THE GLOVE COMPARTMENT I THINK THERE ARE 2 HOSES THAT ARE USED ,BLACK , GRAY , USE A SMALL VACUUM T AND INSTALL IN THE VACUUM SUPPLY LINE ( I THINK IT'S THE BLACK LINE ) TEST DRIVE THE VEHICLE AND SEE IF THE VACUUM GUAGE ON THE PUMP FALLS DURING ACCELL IF IT DOES TURN OFF THE A/C AND RETEST IF IT FALLS . AGAIN CHECK ENGINE VACUUM AT INTAKE MANIFOLD SUPPLY PORT TO VACUUM CANISTER ,, I HAVE SEEN ANYTHING FROM CRACKED VACUUM LINES ,CHECK VALVES, TO CAT CONVERTORS CAUSE THIS

HOPE THIS GETS YOU IN THE RIGHT DIRECTION

Posted on Aug 16, 2010

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http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

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http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

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