padriug

Is any off the shelf phosphate free coolant OK to use? Thx.

a4kquattro

for instance, the audi pink coolant (G12?) reacts with the green stuff and creates a brown sludge..

I run green Napa coolant in my S6 Avant.

padriug

Thanks

VR_Life

When cold, half the coolant stays in the engine block behind the thermostat. You either have to :
- pull the thermostat and flush system with running water
or
- empty fill with distilled water, get engine really hot, circ for 20 mins, repeat 2 times

a4kquattro

I should have elaborated on flush well. Personally I always pull the thermostat and flush with a garden hose whenever I perform a flush on my cars.

padriug

Thanks guys!

TabulaRasa

I think there is a valve that stays closed to the HC if your heater is off.