gpfarrell Posted November 13, 2012 Report Share Posted November 13, 2012 When I was in high school, the windows on my '78 Mercury Marquis would sometimes get all steamed up when I parked it... but that was a completely different situation! :eyebrows: My 2011 MKS on the other hand, seems to have fogged windows on most rainy days. :RpS_sad: I've been leaving the climate control on Auto. If I hit the Defrost button, the system clears the windows almost instantly. But on every vehicle I've owned in recent memory with climate control ('91 SHO, '95 SHO, '99 BMW 528, '03 Marauder, '07 Navigator, '08 Jeep SRT-8, and an '08 BMW 535) I just about never had to manually hit the Defrost button. Has anybody else noticed this? Could I have a bad cabin humidity sensor? Is there such a thing? Thanks in advance, Greg Quote Link to comment Share on other sites More sharing options...
tss Posted November 13, 2012 Report Share Posted November 13, 2012 I have to hit defrost if the conditions warrant it. My GM cars have neeb the same way. Auto works 95 % of the time on my 2010 MKS, except in foggy or frosty conditions - and then it needs some guidance. Quote Link to comment Share on other sites More sharing options...
mjhpadi Posted November 18, 2012 Report Share Posted November 18, 2012 Somehow, I missed this thread, but I've noticed it in the SHO that on cool evenings, rainy evenings, or even with wet hair from diving, the windows will get steamy unbelievably fast. Even with the climate control on auto it doesn't keep the windows clear, almost always have to run it on defrost to keep the windows clear. Not sure why, this is really the first vehicle, I've ever noticed this, most have some air blowing on the window when on auto. Quote Link to comment Share on other sites More sharing options...
shoman04 Posted November 18, 2012 Report Share Posted November 18, 2012 When I was in high school, the windows on my '78 Mercury Marquis would sometimes get all steamed up when I parked it... but that was a completely different situation! :eyebrows: My 2011 MKS on the other hand, seems to have fogged windows on most rainy days. :RpS_sad: I've been leaving the climate control on Auto. If I hit the Defrost button, the system clears the windows almost instantly. But on every vehicle I've owned in recent memory with climate control ('91 SHO, '95 SHO, '99 BMW 528, '03 Marauder, '07 Navigator, '08 Jeep SRT-8, and an '08 BMW 535) I just about never had to manually hit the Defrost button. Has anybody else noticed this? Could I have a bad cabin humidity sensor? Is there such a thing? Thanks in advance, Greg I had the same problen in hi-school to but I was kissing a girl in the winter time.LOL But no problem with SHO. Quote Link to comment Share on other sites More sharing options...
BombshellSteph Posted November 18, 2012 Report Share Posted November 18, 2012 I have the same problems and auto won't clear it and I have to manually set it to defrost. I also can never get the temp right because literally there's a 1 degree difference between windows being foggy vs window having condensation on the bottoms.. I can't win! Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
SHO Rod Posted November 18, 2012 Report Share Posted November 18, 2012 When in auto, the fan speed is very slow once the system gets to the set temp and it doesn't seem to require much airflow to maintain that temp. That is probably why the windows steam up quickly in the auto setting. Even if the A/C compressor is engaged, if there's little air movement, that dry air will not make it to the windshield very quickly, or have much effect when it does. You've probably noticed that when you select Defrost, in addition to the vents shifting to blow directly on the window, the fan speeds up as well. There's a reason there's a defrost setting.... -Rod Quote Link to comment Share on other sites More sharing options...
mjhpadi Posted November 18, 2012 Report Share Posted November 18, 2012 When in auto, the fan speed is very slow once the system gets to the set temp and it doesn't seem to require much airflow to maintain that temp. That is probably why the windows steam up quickly in the auto setting. Even if the A/C compressor is engaged, if there's little air movement, that dry air will not make it to the windshield very quickly, or have much effect when it does. You've probably noticed that when you select Defrost, in addition to the vents shifting to blow directly on the window, the fan speeds up as well. There's a reason there's a defrost setting.... -Rod That's exactly how mine works, but I know on my all our other FoMoCo products, you could leave the climate control on auto and just turn up the fan speed...well, not sure in our Explorer since my wife uses it mostly...not that it's a problem, defrost always keeps the windows clear. Quote Link to comment Share on other sites More sharing options...
gpfarrell Posted November 19, 2012 Author Report Share Posted November 19, 2012 I had the same problen in hi-school to but I was kissing a girl in the winter time.LOL But no problem with SHO. Same here! In high school it wasn't a problem, it was good fun. Quote Link to comment Share on other sites More sharing options...
gpfarrell Posted November 19, 2012 Author Report Share Posted November 19, 2012 There's a reason there's a defrost setting.... -Rod So, why is there an Auto setting? I'm happy my car isn't defective, but a bit disappointed in the design if we frequently need to hit Defrost... that sort of defeats the magic of Auto, doesn't it? Oh, I like being able to manually select Defrost in extreme conditions, but Drizzle never struck me as extreme. Ford needs to re-content the HVAC systems so the work as well as older models. Quote Link to comment Share on other sites More sharing options...
tss Posted November 19, 2012 Report Share Posted November 19, 2012 The primary goal of auto is to maintain constant cabin temperature, versus old rotary knobs you are constantly adjusting to keep cabin temp at , say 70 degrees. Yes, it adjusts airflow, etc, but primary purpose is to maintain a constant temperature without the need for fiddling around with it. Set it to what you want and ignore it...until it gets foggy inside. Quote Link to comment Share on other sites More sharing options...
nameneeded Posted November 19, 2012 Report Share Posted November 19, 2012 Could have something to do with the location of the cabin filter inlets... I don't have my car yet to experience this but if the car is sucking in the damp air or if the design allows for moisture to pool in the system then that may be a contributing factor. Yes? Quote Link to comment Share on other sites More sharing options...
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