Now that the temps in the mid-west are hovering in the sub-freezing temps, I decided to check my sub-zero tank. (Yes, it is still attached) It is empty, and I know it should have a 90/10 ethol-glycol / water mix. What side effects would I see from the sub-zero tank having run empty? Also, I have a jug of 50/50 pre-mix, would that surfice, or should I stick w/ 90/10?

 

Most have disconnected the unit because it seemed like a novel idea when it was first introduced but I believe Mazda realized it didn't work as planned.

 

Heck, run what you have and see if the tank depletes. I'm curious if it works or not. Not that I have one, just curious.

 

I eyeballed a 90/10 mix and put about an inch worth in the bottom of the tank. We'll see what happens.

 

mines still attached but its still full ? im hoping it was not like that from 1987

 

It's been a couple of months, and the tank is nearly empty. So it pumped out on its own. I'm going to fill it up again and try to keep a better eye on it to see if it goes down durring the summer.

 

I had the opposite problem. When I got the car it was bone dry so I filled it back up. I ripped it out when I realized it would siphon/drain completely empty in about a week without ever turning the car on. Surprisingly, I've never had problems starting her even in -20°F Colorado winters.

 

Remove it. Mazda issued a TSB to all dealers that the system should be removed. It is pointless.