@Sky_walker, actually, what I'm advocating is the removal of all coolant as it's currently implemented, so no free collant reserve on any 'mech, ever.
The thing about Battletech is that heat is a critical factor, and can't just be dismissed at the press of a button, the number of heat sinks on a chassis is as essential as speed, armour & weapons, there's no "Flush" option in a Battletech, it's arcade action fun that we would be better without.
The Coolant pod from CBT, would enable mediums like the ShadowCat to carry 2 Large Pulse lasers and 2 coolant pods, firing the lasers 'till the 'mech hits the mid line, then turning on the pods, one after another to boost your heat dissipation, to help keep you firing near constantly (rather than simply removing the heat instantly at a button). Drawback would be that you would have to give up podspace (therefore weapons) to be able to mount the pods, and they explode when hit, doing some damage).
So I'm pro coolant, but anti flush. The flushing idea is a little silly ('mechs pissing themselves? It's meant to be a sealed system), whereas a Heat Sink booster seems a lot more probable, and better for gameplay.
@FD & Sky_walker, on regeneration of the coolant; the pods are just a huge compressor (like you'd find in your fridge or freezer), it's a property of the gas that it's cold when liquid, so recharging the colant is not a problem in cannon. It does not need extra coolant, just time to compress the stuff on hand.
That being said, I see no reason that in the interest of balance and gameplay the coolant pod could not be limited to say 5, 4 second heat sink boosts (enabling you to burn through the 2 pods in the example in one glorious 40 seconds of heat sink boost) with recharge on repair/buy like ammo, I just don't think that it would make things play better than a slow recharging system that you can only gain benefit from in short bursts.