I bought one of those Prestone Flush n Fill kits and hooked it up to the hose that goes to my heater core. Flushed it until nice and clear using a garden hose. Then I drained the radiator and used an air compressor (at 15psi) to force all the fluid out of the system. My plan from there is to fill with distilled water, then purge the system with air again to add my 50/50 mopar mix (they didn't have concentrate). Adding distilled water to the system (using one of those spill-less funnel systems) I only appear to get approx 8 quarts into the system and that includes filling the reservoir tank to MAX. My manual says the capacity is 10.5 quarts. Whats going on here? 2.5 quarts is a decent amount of missing fluid... Am I doing something wrong, or is the manual incorrect?