I'm getting an E40 code on my '87 Deville. Heavy power steering pressure
is present. It could be a connection problem or a bad switch.  Access is
under the car, so that will be a problem for these old bones.  I intend
to be armed with a new switch, just in case, but I'm wondering the 'why'
of the heavy pressure?  Steering works fine, but I've always thought I
heard a low groan when turning the wheel.  The fluid isn't new, so I'm
wondering if the 'heavy' pressure might be the result of
old/contaminated fluid?  If so, I guess I need to bleed the rack/pinion
of the old fluid?  I think I'll do that anyway, so what is the best
method?  Gravity bleed work ok?  Thanks!  Merry Christmas ya'll!

Dave S(Texas)