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Re: '83 A/C ,flaps,,microswitches....... R-12?

Your quotation about using a mixture of 75%-25% ISOPROPANE and Butane has
gotta be wrong.  They ain't no sech animal as isopropane.  Could the substance
have been isoBUTANE.  (Isobutane is the simplest hydrocarbon which is isomeric
with another hydrocarbon - in this case, butane.)

There is a flammability problem with both isobutane and butane.  For example,
the fluid you burn when you "flick your Bic" is butane (probably mixed with
isobutane to some extent).  Now, when you get right down to it, the hazard
with a bit of mixed butanes as part of a cooling system probably won't be
a whole lot worse than a full 21 gallon tank of 93 octane gasoline (that's
petrol to our UK friends :-)).  However, you can probably bet the ranch that
our Safety people will NOT give their approval for such usage. :-(