I've had similar problems with over heating with my '93 windom. My fixes include, changing the radiator caps, changing the water pump, and manually flushing the radiator (not using the liquid radiator flushes but actually removing the bottom cap of the radator and running rods up the passagesto remove clogs). I also had my thermostat removed but i live the C/bean so i can do this maybe u can't, also replace all worn power steering clamps.
I have abosolutely no cooling problems now