What does the sub zero reservoir do? I have one in my engine bay but I have no idea what it does, if it helps it start in the winter that would be awesome!

 

that's what i've always heard. don't know how well that system works being 20+ yrs old tho.

 

It injects a mix of 90/10% antifreeze/water into the intake to prevent icing in cold weather. California vehicles never came with it and Mazda issued a TSB recommending removal of the rest. Does it help, maybe in extreme cold, but I've never needed one.

 

Alright thanks guys! Well, I have no idea if it even works, it had no fluids or anything in it when I got it. So I may just remove the system.