hey all just got a quick question about coolant , my 2001 mk4 golf 1.6 AKL has green coolant in it and i don't think it came factory with green coolant in it ? correct me if im wrong ?

now if i was to change it to the red/pink coolant that i think its meant to have in what problems if any would i run in to ?

i would have to flush the cooling system rather well to insure that all the green coolant is out of the system/ heater core before adding the new pink / red coolant yes ?

any info or input to this would be great as im going to do my thermostat soon and want to buy the correct coolant before i start