billy t.
+1y
So one day it worked and the next day it didn't?
Three things could be happening:
One, you had a rock fly up and hit your condensor and put a hole in it, buy buy 134, you need a new condensor or it could possibly be welded up..
Two, you have had a slow leak for sometime and the pressure just got low enough to trip the low pressure cut off.
The third, and what I am thinking is the most likely... You said that the gauge went into the red. Assuming that was on the low side(pegging it at 120 or so psi), and your compressor isn't pumping, but by that kind of pressure, it seems like you have a full system still. Most likely something electrical. Check the fuses first, then go from there. Hopefully you didn't lose the compressor and it is just something simple.
Your truck has R-134A. They stopped using R-12 in the early 90s.
I do commercial refrigeration for a living, and have a decent knowledge of auto systems, so any questions you have, feel free to shoot them my way.