Another AC Wiring Question - E40 PCM

[TipsyMcStagger]

I know there are a couple of comprehensive threads about AC wiring but most of the info is regarding the analog LS1 411 ECM or similar. I'm using an E40 PCM, which does not internally generate the AC request signal. With the E40, the request signal is serial and is generated in the BCM.

Since I'm not using the GTO BCM and I'm trying to make the system behave 100% as it did in the original GM installation, I got an Arduino module from Thaniel that will act as a stand-in for the original BCM. It will send the serial request to the E40 and everything should function as it did in the GTO.

I guess this means the system should be plumbed and wired to duplicate the way it was in the GTO? In my notes, I have written to use a 92145716 pressure senor and install it in the line between the drier and the condenser. But I've also seen mention of the installing a pressure switch in the line between the compressor and the condenser.

AC is not my strong suit and I'd like to have the lines made this week, so I need to be clear on what sensors I need and where they need to be installed. I'm not sure if this will differ from the LS1 type installations?

As always, all help is appreciated!

[TipsyMcStagger]

How 'bout this; Everything I've read indicates that the three-pin GM pressure sensor should be installed on the high pressure side.

Should it be installed in the line between the compressor and the condenser or the line between the condenser and the drier? Both are high pressure lines.

[BigL350]

I installed it right next to the BMW sensor and it was wired straight to the PCM on my LS1 and it worked perfectly.


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[TipsyMcStagger]

I installed it right next to the BMW sensor and it was wired straight to the PCM on my LS1 and it worked perfectly.

So yours is pretty much where the red arrow is, roughly?

For the sake of conversation, does it matter where it is, as long as it's in the high pressure circuit?

And since I'm asking dumb questions, the BMW sensor is simply left in place and is not utilized, correct?

[RulyLSX]

Doesn’t matter where it is as long is on that line

i had the bmw sensor removed and the ls one welded on,mine has to be plugged in for ac to work

pic of my sensor C5E23E90-5B8A-406E-BB10-E23E5B49DB08.jpg

[BigL350]

Right there, Tipsy.


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[TipsyMcStagger]

Doesn’t matter where it is as long is on that line

i had the bmw sensor removed and the ls one welded on...

Right there, Tipsy.

Thanks guys.