Guys, I stand corrected; looking at Johnathan's photo, it appears that's about the temp that my high fan turns on (105, not 115).
In my '86 manual, it lists a thermal fan switch 105-115, so I assumed it turned on at 115 and off at 105. Maybe at 115 it goes into hyperspeed - ha.

Arthur is right on about the junk that can collect between the condensor and radiator.

I had the infamous low-speed resistor burn out. I thought it was the pressure switch, as stated above, but when I dug down and looked at the resistor, it was pretty obvious (wire fried). I ran a secondary wire from the low-speed relay to the resistor to permanently solve that problem.

DG