Ok....I read once about doing a mod to the inside of the climate control switch to eliminate the A/C compressor kicking on when you turn on the defroster. I searched the forums for over an hour trying to find this but can't seem to find it. Has any one done this before? Or can someone one point me to where I can read about it online? Thanks guys and gals.

Brandon

 

is that why it keeps commin on. i thought it was just a screwey ac system, i guess ill keep it on another setting.

 

I love my truck....but hate the A/C set-up!!!!! heck mine doesnt even work and I hate it!!!

 

My understanding is that if you turn on the "defrost" the AC is supposed to come on. AC not only cools but also removes humidity or moisture from the air. When you run defrost the compressor comes on, again, to remove moisture from the interior air (specifically the windshield) in order to "defog".

 

If you try to de-fog with recirculated air (and no A/C) ... it won't work. You have to use outside air. I don't know where the supply comes from on these trucks at the defrost/fog setting.

On the wife's Toyota, you can select inside/outside and A/C on/off. If you select inside (recirculate) and no A/C ... the windows fog up almost instantly. Choose either outside air OR A/C on and they clear right up.

 

yeah asked the same thing while back no anwser, reasonable question though cause then you can always have it on and still have heat!

 

Cranking your temperature control **** all the way clockwise doesn't get you heat in the defrost position? I get enough heat to melt the ice off the outside of the windshield (too lazy to scrape it in the winter). [8D]

 

nope the a/c take pirority it be nice just to have hot air blowing against the windshield

 

when air passes through an air conditioner the air condenses and because the air is smaller, it cant hold on to as much moisture. if you look under your truck when the ac is on it drips. for example, magine a sponge that is soaked. ac makes it cold and it condenses and gets smaller, which causes the water to drip out of the sponge.
now, after the air passes and condenses and removes water... it gets heated which causes the air to expand. now the air is larger than before (because its heated) and has less moisture in it. for example the original sponge that lost the water is now larger and contains less moisture than before, which allows it to accept more moistture than before.

1 cubic foot of air at sea level contains 2000 gpp (grains per pound) of moisture.

ie.
if you cool the air off enough it will condense and drop 1000 gpp.
if you now let the air return to it original temp it will be 1 cubic foor of air with only 1000 gpp. this allows it to accept another 1000 gpp of moisture from its surroundings.

ac removes moisture from the air, heat makes the drier air accept more moisture which make the surrounding air drier.

i do water damage restoration for work.
if you have any questions about what i just said... ask me when im sober.

 

ya so how we make warm air blow on defrost?