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Went & purchased the A/C Delco air-conditioning pressure switch(cycling switch)#22664328, that is required for the LS1 3-prong A/C plug. Went to thread it on my accumulator & the switch has too small a threads to thread on. Anyone know the cure? :help: Gar
Yes, and it's not easy. The thread from the LS1 is 12mm if I remember correctly. I ran a die nut over the original threads on the drier and machined a chamfer on the pressure switch for the o-ring to seal. The other option is to weld a 12mm tap in the suction line somewhere. You won't find a drier with the the threads you need unless you go to the new LS1 style. Been there done that.
Actually that switch goes on the high pressure side. I used my orignal port for the old R12 high side and it worked great.
Three prong? Wow, my switch only has two. It's inline with the compressor clutch and is also mounted on the high pressure line. If there is too little pressure, no current. Too much pressure, no current. If in the sweet spot, sheer exstasy in the cab. :thumb:
The LS1 switch acts as a high and low pressure switch and was screwed into the drier when I received the motor and tranny. It doesn't work worth a crap on the high side. I kept popping the valve on the back of the compressor instead of the switch taking it out like it should. The 3 wire switch will take the compressor out between 28 and 30 psi. I just went through this and finally got my pressures right.
The switch I have is trinary, goes both ways ( low pressure and high pressure ) and is all done with two wires.
Wish I would have gone that way. How does the PCM control it? That was my problem, I wanted it to all work like a factory F-body.
PCM just turns the compressor on and it pumps until too much head pressure is produced and then shuts off. Never shuts off in my truck since I have the dual fans running at max at all times and that keeps the head pressure down and the cab ice cold. If it runs low on freon the switch will break the circuit to preserve the compressor. Found that out when one of the aluminum fittings broke. Had the fitting replaced with steel and no more worries.
I'm good for now but I'd like to take a look at yours if I decide to switch to a different drier.
Do you have an R12 fitting somewhere inline on the high side? If not, you'd have to get one brazed on there or splice in a fitting inline. I had mine spliced since I didn't want to wait up to a week for them to get the correct fitting. Mine is on the hose coming from the condensor. My 92 truck had one built in there but this 93 doesnt?