quote:...but water looks like baby poo!!!
With repeated normal heating and cooling cycles of the coolant, sediment will accumulate in the bottom of the overflow tank. Periodic cleaning / flushing of this sediment should be a maintenance item.
Cleaning can be done by removing the small overflow hose from the top of the swirl tank and extending it into a bucket. Add water (via a garden hose) and continue until discharged water runs clear.
Or, remove the overflow tank from the car and clean.
quote:..T-stat has a vent hole drilled in it...
I believe that the 330 series T'stat has an air bleed vent in it already. I know that the 333 series did. See pic below.
John