^ totally works, just set the temp to mid, vents on defrost with the AC on. Blast it until it clears up then repeat if neccessary.

If you are doing a long trip just leave it on 1 with the ac on, doesn't get cold since your temp is set on warm.

 

Anytime the defrost is on, the a/c compressor is on. No way around it unless the refridgerant is low or empty. Then it wont work. Just turn the heat on full hot with defrost. Your a/c charge might be low.

 

alternator could be on its way out? Less heat and power.... just a guess

 

that is wrong
AC is not on when defroster is on

 

I doubt that a bad alternator would only have a foggy window as a problem...

And you sir are right becuase ive had to turn it off before when i was out(hot in the day cold at night)

 

**** drives me up a wall

 

You SIR, are wrong! When the "DEFROST" button is selected on any modern day vehicle, including the evolution, the A/C compressor turns on and off, just like it would with A/C in the summer. It doesnt blow freezing cold air because the mode door is fully open to the heater core and blowing full heat. The point is to pull the moisture out of the air and clear the windshield FASTER! There is now way around it except to disable the compressor or have 0 charge. My evo does it, all my local friends evo's do it, my wife's jeep liberty does it, my parents minivan does it, and every other car I've touched for the 7 years Ive been ASE Master Certified do it!

This may not be the root cause of the OP's issue, but you need to get your facts straight before you steer someone in the wrong direction.

 

really... my compressor has never come on one time when the defroster was running. and i know i have good charge and my compressor is fine.

 

You must have a seperate issue going on with the defrost button and its feed to engage the compressor. I even called 3 friends who are driving their evo's right now in 15 degree weather and each one confirmed their clutch cycles on and off with defrost on.

 

I'm pretty sure putting the defrost on automatically turns on the AC

 

yea run the ac for a bit......and you should be good

 

well...

my track car which has no heater core.... used to fog up all the time, especially early morning when there is a lot of dew on the ground.
shaving cream method helps, but it's messy and temporary.
Rain-x Anti Fog worked well. I just had to clean the window really well couple of times then apply few layers of that stuff.

Otherwise, full heat will work too, just takes a bit longer then using A/C.

 

Is the AC turned on by selecting Defrost, or is it turned on when you select Defrost AND have a fan setting other than OFF?

I ask because I use the defroster in bursts.... As in full blast for 1 minute, then after 5 or 10 minutes I do it again.

I don't want to drive around with the AC on burning my mileage..... So if I leave the fan setting OFF in the Defrost mode is my AC still running? Or does it run all the time and after turning the fan off, I need to also move the setting back to vent?

 

try Fog-X or even better... Shaving Cream.... not the gel but use the foam and spread it around.... i also herd liquid soap works too

 

Well just to fill you all in I found the problem my actuator for the fresh air door was unplugged? But just to clear up some issues ALL newer vehicles cycle the a/c compressor when in defrost mode that brings in fresh air that's why its called DEFROST the only way to stop it is the manually push the resurc button.............