Radiator cleaning: What concentration TSP?

[Kevin Trent <trentkc@domain.elided>]

Sometime in the last year or so there was a thread on using Trisodium 
Phosphate (TSP) to clean alfa cooling systems.  I believe that John 
Fielding started the discussion calling the TSP "sugar soap" or something 
similar.

I purchased a small box of Savogran TSP at the hardware store.  The box 
says that it is "formulated for heavy duty cleaning, removes greasy, sooty 
dirt and prepares painted surfaces for repainting."  The box also indicates 
that it has "Average elemental phosphorous content 7.3% in the form of 
phosphates.  Equivalent to 8.5 grams per 1/2 cup."  Instructions for 
cleaning solutions range from: 1/4 cup per 2 gallons (household);  1/2 cup 
per 2 gallons (heavy duty); and 1 cup per 2 gallons (for use after paint 
removers).

I want to do a "in car" flush of my 73 GTV's radiator.  Questions:

What concentration of TSP should I use?

Like many radiator cleaners, I will expect to run the engine to circulate 
the cleaner. I'd like to leave it in for at least a round trip commute to 
work (50 miles).   Any limitations or recommendations on the "run the 
engine" part?

Any other prohibitions or cautions for using TSP to clean the cooling 
system?

thanks,  //kct, Powell TN 

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