What kind of anti-freeze to be used on a 2006 Q-link Legacy. Have no manual.

12.2 qts or 3.05 gallons do not ad antifreeze to car. Use dexcool coolant already mixed at 50/50. If you add green yiu may have cooling and overheating problems I would use brand name dexcool

Capacities are in your owner manual.
https://my.gm.com/content/dam/gmownercenter/gmna/dynamic/manuals/2006/chevrolet/impala/2006_chevrolet_impala_owners.pdf

any type automotive will work fine, I prefer for my own use the green. the pink or orange stuff sets up a chemical reaction, and forms a substance like MUD that wants to tend to clog things up.

eythelene glycol based ,its the only one available and any make will do as they are all the same ,just pretty colours as its naturally transparant ,use 100% neat stuff is best and just fill with that never mind the strengh in cans ,used neat will last for years and not cause any damage ,leave in all year round

Any non-silica formula 50/50 anti freeze. You want to use an anti-freeze that does not have scrubbing particles in it . A standard automotive anti-freeze that has silica particles to scrub rust out of cast iron motors will damage/shorten the life of the ceramic seal in modern motorcycle water pumps.

The tank is an overflow tank for your radiator. You should use a 50/50 mixture of anti freeze and distilled water. The anti freeze should be a non-silica brand like GM Dexcool, Honda, etc. You do not want anti freeze with rust scrubbing particals because the particles will cause premature wear on the water pump seal.

WHAT WAS THE ORIGINAL ANTI FREEZE YOU HAD, ALWAYS STICK TO WHAT YOU HAD BEFORE, DO NOT MIX COLORS

Do use anything but Mopar 100,000 or Zerex g05. As for manual> Sorry not good with links. Go to Chrysler's main website. On the website find TechAuthority, FREE downloads of manuals 2004 to 2010.

Suzuki forenza uses Green silica based anti-freeze. If you mix the wrong kind with it, it will gum up your thermostat (90 dollars) and potentially mess with some of the smaller cooling fluid tubes and passages. Not to mention, the water pump is not to fond of gritty fluid. So if you see discoloration in the bright green fluid, better drain it, flush the system out with a garden hose for 5 to 10 minutes, and refill it with new fluid.

The anti-freeze is put in the radiator. I know that the radiator cap says,"Do Not Remove". Do not be afraid though. This warning is only applicable when the engine is warm and running.
You can open the radiator cap when the car has not been used for about 6 hours without any danger.
Like you can park your car overnight and put the anti-freeze in the morning. Just take not to splash the anti-freeze onto your clothes.
Thank you.