I am a Police officer and i drive a Crown Vic. I just recently got my air conditioning fixed in my cruiser. Sometimes it blows air but no air comes out of the vents. Also, it doesn't seem to be blowing as much air as it should through the vents when it does blow air. Anyone have any idea of why this is happening? I got the compressor replaced and the A/C line.
Thanks! Like it blows air then occasionally it will stop blowing through the vents but i can hear the blower motor working. When the air does blow through the vents it just doesn't seem to be pushing as much as air it should out.
ATM is correct. This is called "mode shifting". Intake manifold vacuum, where the main vacuum hose for the system is connected, is strongest at idle. During acceleration the vacuum drops considerably. To prevent mode shift there's a check valve, usually inline on the vacuum hose coming from the engine through the firewall, to the heat/air conditioning control panel on the dash. There's also a vacuum reserve tank in the system as well. If the check valve is now missing or the vacuum hoses misrouted to bypass the vacuum tank this can happen. For safety reasons, the system will normally default to defrost when vacuum to the system is lost. HTH. -Jim
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