loss of coolent at coolant resevoir

What is your question?

egr failure,deleted at approx 80000 miles.had engine chipped to add approx.75 h.p. at around 96000 started seeing coolant loss but not liquid but white residue at coolant resevoir. seems to occur more under moderate to heavy towing any ideas ?

What makes this problem better or worse?

under moderate towing

How long has your 2004 Ford F-350 Super Duty had this problem?

few weeks