sub-zero starting system?
 

what is that cuz my container is completely empty? my car starts up fine and drives fine so idont know what it does i have a 90 gtu if it matters

Don't worry about it. System was pointless, and basically never worked. Mazda issued a TSB instructing dealers to remove the system. It's likely that your sub-zero pump seized up many years ago.

Just remove the sub zero bottle and hose. Then cap off the nipple it connects to.