On 12/6/05, Tom Sinclair <neeemo@yahoo.com> wrote:
>
> Is spraying hot water on cold glass a good idea?

Sometimes not.  Personal experience many years ago....
Driving a virtually brand new 1967 Plymouth Valiant to go skiing.  On the
way home, coming down the pass, car warmed up and heater blasting, defroster
full on (warm windshield).  We were passed by an 18 wheeler that splashed a
lot (I mean a whole bunch) of slush onto the windshield.  Instant crazing of
the entire windshield.  Not actually broken but when light shown through it,
night or day, it looked like you were seeing a fine crystal structure
everywhere.  I took the car to the dealer where we had purchased it and
showed them the problem.  They agreed to replace the windshield.  (I'm not
sure I gave them all the details).  They replaced it and commented that the
window installer said that as he was removing the old windshield it turned
into a million pieces, only held together by the plastic laminate in the
middle.

Loren Busch