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does this actually mean if i ever try to defrost my windshield, i should never turn the temperature knob to the heat section????

i mean having ac + heat on at the same time doesnt make sense, but that's what i have been doing...... :eek:hnoes:
 

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I did the mod back in December and noticed that my average fuel mileage increased. But at the same time I noticed that my windows take a bit more time to defog.

Strangely, when I turn on the window defrost, I don't have to turn off the AC compressor.. although I can turn it on if I wish.
Better gas mileage FTW:yeahthat:
 

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Discussion Starter #23
Turn the temperature knob wherever you please, but the AC will be on, sucking down your expensive fuel.

It does seem stupid, and I don't understand why Honda felt the need to change from there previous system.
 

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but its blowing hot air when i defrost using heat and now thinkin ac is on..... doesnt really make any sense

i used to always feel worse mileage whenever i use defrost, i always wondered why :thumb:
 

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but its blowing hot air when i defrost using heat and now thinkin ac is on..... doesnt really make any sense

i used to always feel worse mileage whenever i use defrost, i always wondered why :thumb:
AC chills and dehumidifies the air. So in summer, you sweat less because the air is not only colder, it's drier. In winter, the defrost pulls the moisture from the inside of the windshield and/or windows if there's condensation and/or prevents condensation from forming on the windows while it's defrosting. I followed the steps and turned off the auto AC. When I need it, I simply just press the button to turn it on. It helped my fuel economy quite a bit! :thumb:
 

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AC chills and dehumidifies the air. So in summer, you sweat less because the air is not only colder, it's drier. In winter, the defrost pulls the moisture from the inside of the windshield and/or windows if there's condensation and/or prevents condensation from forming on the windows while it's defrosting. I followed the steps and turned off the auto AC. When I need it, I simply just press the button to turn it on. It helped my fuel economy quite a bit! :thumb:
Very well said +1:thumb:
 

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After seeing this thread and doing this 'mod' to my Si, my mileage for the past 3 months or so has been near summer levels!

Just thought I'd give it another bump.
 

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So in my FA5 I noticed the A/C light comes on after i did this. Before when I would use the defrost, I could hear and feel the A/C come on but the actual green light would not illuminate. Now, after i did this, it lights up but I can now turn it off.

I wish it would stay off each time I used the defroster instead of each time having to turn the A/C off.
 

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I bought my '07 sedan new on 7/31.

When I use the defroster, the A/C light never comes on. I know I did not deactivate the auto A/C, so I'm wondering if it came from the factory this way. I'll have to try depressing the a/c button with the defroster to see if both lights illuminate.

Also A/C compressor related... in summer, my A/C works good, but at idle, when I stop for a traffic light, it seems the A/C stops and just the fan runs. Then when the light turns green and I accelerate, cold air starts blowing again. If I use max a/c, I get cold air all the time. I can never tell when the compressor starts or stops. Could this be related to the auto A/C feature?
this is because non-max ac takes air from the outside, and its taking in hot air from your engine, and altho it should still be able to cool it, its probably not doing a very good job.. max ac recirculates the air in the car
 

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Ah, this is awesome. I've always preferred to leave the air vents on 'defrost' in all my cars (just the right amount of airflow into the cabin without it blowing right in my face). Now I can turn off the AC and get my 25hp back ;)
 

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Ah, this is awesome. I've always preferred to leave the air vents on 'defrost' in all my cars (just the right amount of airflow into the cabin without it blowing right in my face). Now I can turn off the AC and get my 25hp back ;)
holy **** dude where ya been? How many km's on your car since we all last saw each other?

I hope u are coming to the whislter run with us this year or atleast one meet.
 

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Ah, this is awesome. I've always preferred to leave the air vents on 'defrost' in all my cars (just the right amount of airflow into the cabin without it blowing right in my face). Now I can turn off the AC and get my 25hp back ;)
Plus you save gas, extra $ in your pocket.:woowoo::spinning::thumb::cheerleader::yeahthat::dancing::badger::dancingcoolsmiley:
 

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i checked this on my car today, somehow mine is set to the modded setting already. my ac doesn't come on with the defrost...:dance:
 

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Yes it does... the light just doesn't come on. After the mod the light comes on when you turn it to defrost and actually allows you to turn it off (whereas right now you can't)
 

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Originally Posted by Pukuyo
i checked this on my car today, somehow mine is set to the modded setting already. my ac doesn't come on with the defrost...
check again. put the car key in and turn to the on position. no turn the button so it blows toward your face and hit the ac button on and off. then leave it off and then turn the botton to the defrost. you should hear the compress come on even if the light doesn't.
 

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i know this thread is super old. but just wanted to thank you guys. ive been getting puddles of water under my car and i couldn't for the life of me figure out why because i haven't been running the AC in 30 degree weather, but i do typically have the defroster on. After reading through this, i did the mod and hopefully i wont have to deal with mysterious puddles under my car until summer when the AC is actually supposed to go on.
 

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i think the puddle is supposed to be normal... i think i still get a small amount of water dripping after Ryan33 did this mod to my civic :) i just wanted to have this mod so that i dont use the gas a lot.. :)
 
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