Jumping the ac low pressure switch?

[kslhol]

I have searched a lot of threads regarding ac problems. Most mention jumping your low pressure switch to see if you have a problem with your freon level, or if your compressor is toast. My problem is that I am not exactly sure how to 'jump' the switch.
Can someone explain in terms a simpleton like me can understand .
I have spent over $1400 trying to fix my ac (including retro 134 fit, accumulater/drier, evaporator, the entire tube assembly and countless leak tests. orifice tube. Labor, labor, labor)
Please help I am getting tired of having the truck in the shop constantly, but nothing to show . Any help would be great.

 

[kslhol]

O.K. I took the truck to a local shop, and he tested the ac, put in one can of Duracool, and it works!!

Soon as we get the ac going nice and cool, the truck overheats.

He says the problem is not the ac, but the cooling fan and clutch. I believe it cause driving at highway speeds, even the outside air was blowing warm into the cabin. If the engine can't cool down neither will the ac. Charged me $25 for the recharge, fixed a vacuum leak that was making the Explorer idle very fast, and all this 15 minutes before they closed.

I just went in there to book an appointment for him to look at it, and less than half hour later I was fixed, and diagnosed for the root cause. Sweet eh?