Maybe peepoles do not know what you are asking? I sure don't
are you asking radiator flush? Intercoolers usually only have air in them
Radiator flush... last page shows where drain plug is
coolant change.
I have a stillen supercharged Z that had a stillen "aftercooler" system to cool the supercharged air (some call this an intercooler but it really isn't) it just used regular radiator fluid. Alot of people like the redline water wetter additive (you can buy at any auto parts store). As for changing the fluid on this thing there are some hex head drain bolts on either side of the radiator toward the bottom, or you can just pull a hose off and drain it that way, or take it to grease monkey and have them do it in like 5 min for 30 bucks or something stupid like that......because radiator fluid is sticky and not fun to spill everywhere
I just took all that aftercooler stuff off and went to a true air to air intercooler system supplied by TOPGUNZ here on the 370z.com.
if you post a pic of what you are calling an intercooler maybe someone could help better too