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Old 11-07-2003, 10:40 PM   #1 (permalink)
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Toyota OBA Stock A/C ?

There is a low pressure switch wire (on the stock a/c) that needs to be disconnected ( wires are behind the glove box) in order for the a/c clutch to be activated with the stock a/c switch. My question is could anyone please tell me which wire(s) they are and any thing else I need to do to use the stock switch? Thanks for you help.

Vehicle is a 85 Toyota P.U.
Engine 22r


I did search - on board air, onboard air and found people who talked about it but did not say which wires there were. Thanks for your help.
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Last edited by WHEEL N TOY; 11-07-2003 at 10:41 PM.
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Old 11-07-2003, 11:17 PM   #2 (permalink)
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It's the only pressure switch that's on the condensor behind the glove box. You don't want to disconnect them, you want to jumper them. Other than that, nothing else needs to be done to use the factory dash button (which also ups the idle a bit, something you want anyways).
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Old 11-07-2003, 11:31 PM   #3 (permalink)
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Thanks for the reply. So I unplug it and connect the two wires together? I am just trying to be careful. I don't want to fawk things up.
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Old 11-07-2003, 11:53 PM   #4 (permalink)
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I am going to this tomorrow. Now to wire in the new pressure switch (square D), it has to be wired in to turn off the compressor when the tanks is full. Correct? Do I do this with the wire coming from the clutch of the A/C compressor?

wire coming from harness ...... to the sqaure D ....... to the a/c compressor clutch.

Is this correct?
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Old 11-08-2003, 12:16 AM   #5 (permalink)
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OK, link the two wires that go into the factory switch together.
Then, wire the new pressure switch inline between the push button and the clutch. It's only one wire now, so just cut it and splice the new pressure switch in. It should just have 2 wires...

But remember, even if the pressure switch is triggered because your at 100psi or whatever, if you still have the AC push button in, you'll still have the high idle. So, if you're not using the OBA, turn it off (don't let the Square D do all of the work for you).
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