Thanks Tony ! Got the coolant tester, wierd instrument. The O'rielly guy told that if four balls are suspended, your coolant is good. That was true, the coolant made four balls suspended. However, there was no change in Gauge readings, between M and A on highway speeds and between A and L in stop and go traffic.
BTW ford cars are tough, I realized that I might have driven 1000 miles on low coolant. My friend's Ford taurus has done about 15K miles with coolant under minimum, and is still running strong. To add to that this is all in Texas summer. Last summer we used the same car with low coolant to evacuate for the Hurricane in the crawling traffic.
regards,
