John,
Is that 1500 rpm figure when the AC is in operation on a parked car at  idle?
 I'm thinking
part of problem is that my idle rpm is set way too low, and when I put the
AC on the
engine wants to stall until it warms up enough.  My mechanic and I go  round
and round
cause he says setting the idle up to high is bad for the engine, and I keep
wanting him
to give it a boost ;-)
James in Houston
87 Westy (the Phoenix)