Coolant Additives Available here. Like everything else, your car’s coolant system gets clogged up over time. Coolant additives can help clear out the clogs and give your car a performance boost, as well. At MicksGarage.com we sell coolant additives that are safe for metal and rubber hoses, so you never have to worry about what kind of hoses your car has. In addition to that, our coolant additives are safe to use with all types of radiators. Getting optimal performance out of your car can be expensive and time consuming, but it can also be a matter of simply cleaning out your car’s systems. Let MicksGarage.com help you find out which one it is for you.