This is a bit of an issue, but it's fairly easy to solve.
Here's what I do to make IC2 coolant (for making overclocker upgrades):
1. Grind up (In Macerator) 8 Lapis into Lapis dust
2. Make generic fluid cell
3. Make infinite water source (various methods, I use the usual 3 x 1 trench)
4. Right click the MIDDLE source water block with fluid cell
5. On the Canning machine's UI, select 'Fill tank from cell' mode
6. Insert the Fluid filled cell, it will be drained of water and you will have an empty cell returned
7. Now, here's the important bit, select 'Enrich' mode on the canning machine
8. You will notice that the machine has 'two tanks' one on the right and one on the left, the water you just filled the machine with may be in the right-side tank
9. There is an option on the canning machine UI to 'swap tanks', click this once, you will now see the water tank move to the left side
10. Now, it's time to create the IC2 coolant!, you need to decide now if you want to produce a 'coolant cell' or simply fill right-side tank with coolant, if you are just wanting a coolant cell, insert your (now empty) coolant cell into the machine (shift-right click should do the job), the cell will be in the right-side box above the right-side tank.
11. Now, insert the 8 lapis dust.
The machine will now spend a few moment 'processing' the coolant, depending on the texture pack you are running you will see some arrows on the UI. The canning machine will
always attempt to fill any empty cell you have inserted before it's internal tank
You should now have a cell filled with IC2 coolant, to make a '10k' coolant cell you can take this cell and in a crafting grid use four tin item casings (top, bottom, left, right) and you have a 10k coolant cell, you should also get your IC2 generic cell back too.
If you forgot to put your empty cell into the machine when you processed your IC2 coolant, don't panic, simply change the machine mode (via the UI for the canning machine) to 'empty from tank', insert your empty fluid cell and (possibly) swap the tanks so the IC2 coolant is in the left tank, and the cell will be filled with coolant.
I hope this helps, those who know more about IC2 than me, please let me know if above steps are not correct and i'll update my post.
-Wuffle!