Coolant change help

[dsallean]

Howdy folks,

This weekend I attempted to tackle the front engine mount replacement along with a new water pump, thermostat and coolant. After just completing the IMS, RMS and new flywheel/clutch and variocam tensioner pads project I thought I might as well take care of these other items while the car is on stands. I was pretty certain the engine mount was original and needed replacement as well. I was correct regarding the mount, it was cracked all the way around and was due for replacement.

My question concerns the coolant. I searched and read up as much as I could find regarding draining the existing coolant and which proper coolant to put in the system, etc. so I thought I was pretty well informed and ready. I ran the climate control up to high, removed the coolant drain plug as well as all three large hoses and the two heater core hoses that lead to the front radiators. I also removed the water pump and thermostat housing. I angled the car by lowering the back end and when complete I was still only able to get approx. 5 gallons of the old coolant out. Oh, I did remove the coolant cap as well. Coolant was green, could be original Porsche coolant from 2001 but I have no way of knowing for sure.

I did install the new water pump, thermostat, engine mount and reconnected all the hoses. I also have an Airlift to refill the system with the new Porsche pink coolant. I should probably fill the system with distilled water first to flush.

My concern is I think I did what I should have to remove the coolant but I didn't get the 6 or so gallons out. Will flushing with water once be enough to go ahead and refill with the new coolant? It may seem like a simple question but I don't want to make a mistake after getting this far and I want to put the car back on the road.

Thanks

Dave in TX
2001S