Antifreeze question

[Preston Brown <pbrown@econ.yale.edu>]

My girlfriend was driving my 86 5KCST today, and the coolant level light
came on.  Not knowing better, she topped up the antifreeze reservoir with
'Peak', which I believe has phospates in it, correct?  She only used about
a 1/4 of the bottle, but... should we have the coolant system drained and
refilled with phosphate free stuff?  What danger am I in if I don't (i.e.
hole in radiator in 6 months, etc...)

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 -Preston Brown
  preston.brown@yale.edu