Write-up: A/C for the 1JZ the simple way

angrydrone

I'm a real Canadian
Mar 11, 2006
156
0
0
Ft. Worth/College Station
How to install 7M cap and A/C lines

Step 1: Replace the 1JZ cap with one from a 7M.

Step 2: Hook up A/C lines. The power steering bracket will interfere with the lines so it will have to have some metal taken off with a grinder.

Step 3: The stud for the A/C compressor bracket needs to be ground down or replaced with another bolt.

How to wire A/C for 1JZ the easy way

The general idea is the wire going into pin 9 on EA2 connects to the ac clutch magnet relay and replaces the blue wire on that plug.

Step 1: Remove battery.

Step 2: Locate pin 9 on the male side of the EA2 connector. It should be a blue wire (possibly with red rings). You can be sure that it is the right side of the connector by noting the small “9” written next to the pin.

p1103871_1.jpg


Step 3: Locate the connector underneath the A/C clutch magnet relay. This is below and on the motor side of the fuse box. The male side is 4 pins (blue-red, yellow-green, brown, and blue).

p1103871_2.jpg


p1103871_3.jpg


Step 4: De-pin the blue wire (not blue-red) and cover it up somehow. This wire is no longer needed.

p1103871_4.jpg


p1103871_5.jpg


Step 5: Figure out where the wire from pin 9 on EA2 leads to. I assume that it will go nowhere, because on both the cars I have worked on this was the case. If it leads somewhere de-pin it from wherever it connects. If not, I just found an extra connector and soldered on a pin.

p1103871_6.jpg


Step 6: Insert this pin into the empty slot on the connector from step 3 (there should be an empty pin because of step 4).

Step 7: Locate the ground coming off the compressor. Bolt the terminal to the hole in the red circle on the left.

sm_photo_missing.jpg


That should be all you need to get it working. It is very simple. Good luck!

-Chris
 
Last edited:

tissimo

Stock is boring :(
Apr 5, 2005
4,238
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Melbourne, FL
Easiest way is just cut the spade connector that goes the the 7m compressor and wire it to pin 9\


As for the ground, you see the hole on the compressor? I just screwed it down there instead of running a new wire.
 

GotTurbos?

2J = Here; Swap = Near
Apr 24, 2006
951
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36
Dallas, TX
viperkillertt;1104236 said:
Quick question, what is the problem with the stock 1jz equipment? Mine bolted right up.

Which part are you talking about? You use the stock lines, components, and 1jz compressor, but you have to have the 7m AC cap and you have to machine the PS bracket to make it fit. I'd be surprised to see anything different.
 

angrydrone

I'm a real Canadian
Mar 11, 2006
156
0
0
Ft. Worth/College Station
tissimo;1103919 said:
Easiest way is just cut the spade connector that goes the the 7m compressor and wire it to pin 9\


As for the ground, you see the hole on the compressor? I just screwed it down there instead of running a new wire.

I guess its just one wire or the other. I did not see the hole on the compressor. I must not have looked hard enough. Thanks for the heads up.
 

tissimo

Stock is boring :(
Apr 5, 2005
4,238
0
0
40
Melbourne, FL
angrydrone;1104672 said:
I guess its just one wire or the other. I did not see the hole on the compressor. I must not have looked hard enough. Thanks for the heads up.

sm_photo_missing.jpg

just screw it down there for anyone else thats going to be doing this.
 

becauseican

Supramania Contributor
Mar 31, 2005
1,451
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0
Vancouver
www.bicperformance.com
Ok, so I got my A/C recharged yesterday with the Duracool stuff and for the first time in 6 years my car blows cold air!!!! no the problem is It doesnt seem to idle up when the A/C is on it idles at 500 rpms when it is on. Also ,my car runs pretty warm when the a/c is on, its like 195 degrees with 90-95 deg outside temps. I guess I will have to turn the a/c off on long highway uphill stretches, and I am running a CSF race rad and the FAL 210 fans.

Which wire at the ecu activates the idle up?. Some one needs to rewrite A/C wiring at ECU, there is little info out there and Ricks site seems to be wrong.

Randy
 

Spaniard

Banned
Oct 21, 2005
524
0
0
La pearla PR
becauseican;1105552 said:
Ok, so I got my A/C recharged yesterday with the Duracool stuff and for the first time in 6 years my car blows cold air!!!! no the problem is It doesnt seem to idle up when the A/C is on it idles at 500 rpms when it is on. Also ,my car runs pretty warm when the a/c is on, its like 195 degrees with 90-95 deg outside temps. I guess I will have to turn the a/c off on long highway uphill stretches, and I am running a CSF race rad and the FAL 210 fans.

Which wire at the ecu activates the idle up?. Some one needs to rewrite A/C wiring at ECU, there is little info out there and Ricks site seems to be wrong.

Randy

I agree. There should be a rewrite cause its not idling up and I find the stock ecu compensating for the extra load. I find that the compressor really isnt turning off as well, regardless of in-cabin temp. chosen. The car does run hotter, your electric fans may be the culprit there, but a 195 deg. is not bad. Were your high and low pressure lines in check as far as pressure at fill up? Do you have a fan on your condenser? The CSF race rad, how many cores is that?
 

Satan

Supramania Contributor
Mar 31, 2005
1,594
0
36
Tampa
Looking in the TRSM (A/C Section), site searches, and FAQs, I can't find what the right amount of R134 to use in place of the R12. I thought the rule of thumb is 80% of whatever the R12 capacity was... Just need to know what that capacity is.

Going to look at different sections of the TRSM now, 'cause I know the capacities/torque values sections are there somewhere too. Would just like to know what worked for ya'll...
 
Satan;1107163 said:
Looking in the TRSM (A/C Section), site searches, and FAQs, I can't find what the right amount of R134 to use in place of the R12. I thought the rule of thumb is 80% of whatever the R12 capacity was... Just need to know what that capacity is.

Going to look at different sections of the TRSM now, 'cause I know the capacities/torque values sections are there somewhere too. Would just like to know what worked for ya'll...
A lot of the time the cans are in lbs equivalent to r12. I know that my Duracool cans are each equivalent to one can of r12 standard even though they are only like 6 ounces instead of 16.
You also watch your sight glass and look to see when it is full. Also you can get the gauges to see when it is actually full.