As an update, decided to use the "Evapo-Rust Thermocure" designed specifically for cooling system rust removal. After running the engine for 15 minutes or so a quick test sample of water is now jet black, Something is happening! A little more time in there, and a couple of flushes with plain water, and then back to regular anti freeze mix. I think that's enough obsessing about this problem,
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.