The top speed on my blower fan does not appear to be blowing air at the
maximum speed.  The force of the air seems to be marginal.  I have
replaced the blower motor with a heavy duty version, rebuilt condensor
box, all new seals and tubes so there are no leaks.  I have replaced
the electronic relay on the fire wall.  The blower switch inside the
car, operates at low and high speed,  cuts off in the middle range, so
I suspect a dirty contact here.  When I checked with other corvette
owners in the area, they said the top fan speed on their vintage 70's
corvette car was marginal as well.

Any ideas on how to get the full fan speed for the blower?