But...why does the A/C compressor cycle on and off whenever the defrost setting is used?
I've been hearing a chirp noise every 20-30 seconds, so while my hood was up and my defroster was on, I noticed that whenever the Compressor clutch engaged or released, thats when I would hear the chirp. I've been thinking for months that it was my belt slipping.
It just seemed curious that I'm using my heat, but my A/C compressor is running. Gotta effect gas usage too.
[size=75]2003 crewcab-flowmaster muffler w/dual exhaust and 12" stainless steel tips, cold air intake, color matched bug deflector, LED taillights, Lund tri-fold tonneau, projector foglights, clear corner lights, neft bars, billet grill, Huskey floor mats, molded mud flaps and a Hunter Grill guard. Mods for next years budget...2" body lift, fender flairs, bigger wheels and tires, CB radio.[/size]
Seems that we are both laymen when it comes to your question. Bear with me because it is all magic to me. The AC compressor is on when late model rigs have their setting on defrost. It not only keeps your ac compressor oiled and active but, assists in removing humidity from you cab.
OK guys, That is as much BS that I can expel in one evening. Help him out~
[size=75][b]"For those who have fought for it, [i][color=red]FR[/color][color=white]EE[/color][color=blue]DOM[/color][/i] has a taste that the protected will never know."
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[b]"Those who don't know history are destined to repeat it." Edmund Burke[/b][/size]
Removes the humidity wins. The air goes through the heater core where it warms. Warm air is less dense and can contain less water. It passes over the evaporator where, surprisingly enough it condenses. This removes the moisture from the air and helps to defrost your windshield.
Hows that for a story
If you don't think you need it try pulling the AC clutch connector to disable the compressor. Your windshield will fog up.
"Speed doesn't kill, suddenly becoming stationary does." - Richard Hammond
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[size=75][b]"For those who have fought for it, [i][color=red]FR[/color][color=white]EE[/color][color=blue]DOM[/color][/i] has a taste that the protected will never know."
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[b]"Those who don't know history are destined to repeat it." Edmund Burke[/b][/size]
This is a first! Are you sure no water fowl are lost and flying within 20 miles of me?
[size=75][b]"For those who have fought for it, [i][color=red]FR[/color][color=white]EE[/color][color=blue]DOM[/color][/i] has a taste that the protected will never know."
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[b]"Those who don't know history are destined to repeat it." Edmund Burke[/b][/size]
I knew I could depend on you guys. Thanks for clearing that up.
[size=75]2003 crewcab-flowmaster muffler w/dual exhaust and 12" stainless steel tips, cold air intake, color matched bug deflector, LED taillights, Lund tri-fold tonneau, projector foglights, clear corner lights, neft bars, billet grill, Huskey floor mats, molded mud flaps and a Hunter Grill guard. Mods for next years budget...2" body lift, fender flairs, bigger wheels and tires, CB radio.[/size]
In a weak attempt at conserving gas mileage and to eliminate that pesky cycling, I disconnected my compressor for a while.
I was unable to keep the windshield fully defrosted. Once reconnected the difference was very noticeable.
"Speed doesn't kill, suddenly becoming stationary does." - Richard Hammond
"Speed is just a matter of Money - How fast do YOU want to go?"-Mechanic from Mad Max-
If at first you don't succeed - Don't take up Skydiving! - ThunderIIKE7CSK
I really don't understand all the workings but, it beats the hel_ out of people driving around with their knob turned to recycle and wiping the inside windows when they can't break away for a moment with whatever all important freakin' cell phone conversation they are having! Yes, poor grammar and a run on sentence from hell!!!! So be it!
[size=75][b]"For those who have fought for it, [i][color=red]FR[/color][color=white]EE[/color][color=blue]DOM[/color][/i] has a taste that the protected will never know."
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[b]"Those who don't know history are destined to repeat it." Edmund Burke[/b][/size]
"Uses less fuel driving down the road at 20MPH or faster, than having the windows down, lol." Negative on that! Myth busted!
They did this on Mythbusters with two identical Ford Expeditions. Same weight and gas, one with A/C on and the other with windows open at 45MPH. The one with windows open went quite a bit longer.....
[size=75]I didn't do it, it was already like that when I got it.[/size]
[size=75][b]"For those who have fought for it, [i][color=red]FR[/color][color=white]EE[/color][color=blue]DOM[/color][/i] has a taste that the protected will never know."
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[b]"Those who don't know history are destined to repeat it." Edmund Burke[/b][/size]
Negative on that! Myth busted! 