Also have seen so much visible water vapor one crew thought they had a fire...
I think it was FAM-2 or 3 in the E-2, (the first USN plane I have flown where the AC actually works fairly well) and it went stupid on us. Stuck full cold. Would be OK, but it's getting dark and it's now foggin like a mother.
Me (to IP): Hey dude, is it supposed to work this well? (I'm fanning the fog trying to see the altimeter)
IP: No, turn it down.
I turn it down (as in warmer), no response.. I try auto. It gets worse.
Ended up doing more or less the last part of smoke/fume elimination with the ditching hatches open to keep the fog out. I'd never flown the E-2 with the hatches open, it was kinda neat. Windy as hell though.
I have a picture of the tube in the P-3 from a couple nights ago that I'll have to see if I can find. It looked like something out of Star Wars.
Even better when you forget to hit defog before descending out FL270 on a long-ass XC to hit the pattern at homefield. Break, power up, standard barrage of ice balls out of the ECS vents.That a/c doubles as a snow cone maker or smoke machine when you come up on the power right after the break on an especially hot and humid day.
Cockpit starts to fog, defog doesn't work. So IP tells me to put ECS to RAM AIR. Roger that, sir. Humid Mississippi air rushes in and coats EVERYTHING so bad the freaking HUD starts to fog up. Full stop, taxi back, damn near IMC in the cockpit by the time we reach the angle off.