Why would you want to do that? The switch is there to prevent damaging the system by not allowing the compressor to turn on when it is out of Freon. Charge the system and let it turn on when enough freon gets in the system. You can then look for the leak and fix it properly.

 

@ aste25, for one you don't know if the switch is bad or it's actually out of freon or low enough to keep it from coming on. Also it's a diagnostic process to see if the clutch is engaging and or if the compressor is bad. Throwing parts at it IE charging the system, is throwing parts at it and wasting money.

 

Or, you can do it the right way and recover what's in the system to see how much was in there. If it had a full charge and wasn't over or under filled, then you can start to look at the switches and such.

The refrigerant is also what carries the oil to lubricate the compressor, so if there isn't any refrigerant, there won't be any oil getting to the compressor when you jump the switch.

 

this discussion isn't worth the hassle. there's more than one way to skin a cat.

 

In the op's first sentence he says it is out of Freon. I'm sorry if I seemed incompetent by taking the man's word that it was out of Freon. If he is unsure if it is empty or not, he can hook a set of gauges up and see what the pressure is. If it is low enough for the low pressure switch to not allow the compressor to kick on, the base pressure will be very low or zero. Last I checked, hooking gauges up is not considered "throwing parts at it". Often times the only way to find a leak is to put enough of a charge in it to see where the leak is coming from. Bypassing the switch before performing some basic checks is a good way to have to "throw some parts at it" by replacing a compressor and other parts you ruin because there was no lubrication/Freon flowing. I agree that shorting the switch can be a valid diagnostic procedure, however, in this case there are other diagnostic procedures that should be done first.

 

^+1

 

Anyone know how to jump the 3 wire switch?

 

I thought you discovered that is not the way to do it. Just put a flippin gauge on the thing and see what is going on.

 

@Walkers I did put gauges on and gauges said just switch to see if prsessure switch is defective.

 

That makes absolutely no sense. What did the gauges read?

 

Gauges read. Low side 35-70psi while adding Freon and compressor engaging intermittently. High side stayed at around 60 and ever moved while compressor engaging intermittently. Low and high lines and compressor never got cold. System only took 1 and a half cans 134a after system was evacuated.

 

Sounds like the switch is doing what it is designed to do. Looks like you havent got enough refrigerant in there yet.

 

Thats what I thought not having enough 134 in System. However I can't get it to take anymore. It seems like its not circulating from the low side to the high side. First thought Line was stopped up at orfice tube. However that was not problem. Is it possible the accumulator is stopped up? Any suggestions checking for clogged lines?

 

What are you using for delivery?

 

I have a set of AC manifold gauges.