3.4 Swaps The 3.4 V6 Toyota engine

How to: A/C for your 3.4 swap

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Old 04-28-2012, 09:49 PM
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Nice to hear you got it working. I wasn't sure if the pics would work, but happy they did and sure a lot of other people will be as well!
Old 04-28-2012, 10:17 PM
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hey vas did you edit your original post i was trying to figure out how to un hook what you said earlier...
Old 04-29-2012, 07:38 PM
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If you hooked it up as per the original post, then the only thing you need to change is to unpin the "AC1" wire on the new ECU at plug "D" or E12 (in my case) pin number 16, or cut it.
Old 04-30-2012, 07:40 AM
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Nice thanks for the help I couldn't remember exactly what I did before...
Old 05-14-2012, 08:28 PM
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so today we gave it a charge and after repairing a leaky rubber line i can say that the ac works flawless... way to go!
Old 05-14-2012, 09:04 PM
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That's great to hear! First confirmation checked in!
Old 05-15-2012, 03:39 AM
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I had just decided last night that I wanted to go ahead and hook up the A/C in my runner, and today find this thread. This is great. Thank you in advance for taking the time to put it together.
Old 05-15-2012, 04:35 AM
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Originally Posted by wii_tarded
I had just decided last night that I wanted to go ahead and hook up the A/C in my runner, and today find this thread. This is great. Thank you in advance for taking the time to put it together.
You're welcome. Report back when/if you get it going and get a few miles on it.
Old 05-15-2012, 07:22 PM
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Dude that is awesome.. I will go unhook that ac1 wire and have a good idle again! ugh.. so those two wires must be what the ecu uses to turn the compressor on or off. I remember working with I think ukrunner, and he had said if you hook up act, then the compressor will not engage. Glad that we were just over thinking it! and just had to get power to the clutch lol.
Old 05-15-2012, 07:36 PM
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Hamish, hey man a lot of my info came you and UKRunner's old threads.
Old 05-21-2012, 06:41 AM
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I finally got my a/c hooked up after chasing down a bunch of leaks. Compressor kicks on and off just as it should. However, when I turn my a/c on, my idle drops to about 5-600 rpms, and it turns off the compressor. I have to rev it above 750 for it to come back on, so I have no A/C when sitting still.....
Old 05-21-2012, 07:12 AM
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There's a knob on your A/C amplifier behind the glovebox that adjusts the A/C compressor RPM shutoff point. Try turning it one way or another until the compressor kicks on at 5-600 rpm. Mine too idles about 600 when A/C is on, but compressor stays on, go figure...
Old 05-21-2012, 07:30 AM
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Originally Posted by vasinvictor
There's a knob on your A/C amplifier behind the glovebox that adjusts the A/C compressor RPM shutoff point. Try turning it one way or another until the compressor kicks on at 5-600 rpm. Mine too idles about 600 when A/C is on, but compressor stays on, go figure...
You sir, are a life saver! Thank you for this information!
Old 05-21-2012, 08:41 AM
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Originally Posted by Replicant
You sir, are a life saver! Thank you for this information!

i couldnt reply fast enough but this is the trick!
Old 05-21-2012, 11:57 PM
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Would this work with the 3.4 compressor or would i need the 3.4 amplifier?
Old 05-22-2012, 06:43 AM
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Either compressor, stock amplifier. Info is on the first page, first post.
Old 05-22-2012, 02:50 PM
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just charged my ac and had the high idle problem, came back to this thread and found out that it had changed. Disconnected (ie cut) the ACT line and now she idles like a champ. Thanks a lot guys!
Old 05-24-2012, 12:13 PM
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I must have problems with my ac amp or pressure switch or something, I cant get power to that wire to save my life.........I ran a lighted toggle switch to dash works fine!
Old 05-24-2012, 12:17 PM
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Can't get 12v to the A/C magnetic clutch wire? If you put 12v on the wire off the compressor, does the clutch engage on the compressor? Also the clutch will not engage if the system is low or empty. You'll have to manually jump the clutch wire to 12v to pull refrigerant in, until the low pressure sensor will allow compressor to run.
Old 05-24-2012, 12:30 PM
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I did jump the clutch wire to the battery pos and the clutch did engage and i was able to give it a charge but still no power to the black-white wire at kick panel when i switch on the ac button (btw the ac has never worked since ive owned the truck) I figure the pressure switch or the ac amp is bad!


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