[urq] A/C Fan question

[Justin Riley]

This weekend I finally got the expansion valve changed in the wife's ur-q.  Bought the required amount of R-12..(Not 134a, as I tried it in the Blue q without much success).  This is the second ur-q I have refilled with R-12, and in both cases, the radiator fan does not automatically run at low speed when the a/c switch is activated.  It will run when the high side pressure reaches 250, but that is too high for me...  Is this normal?
 
 
In my blue q, I ran a wire fron the a/c switch to the low speed fan relay, so that it would trigger the low speed fan any time the a/c was on.  I will do this in my wife's car as well, unless someone can clue me in to where to look in the stock wiring.  Both patients are 1985 model ur-qs.