How to make AC work with your swap, aka: Need help with AC wiring thread Options

[lagos]

ok... so my AC hasnt worked since the swap and i figure now is a good time to wire that crap up. so i have my harness apart and im trying to look at the wiring diagrams to figure out a few things. seems like i need some help.

"ac amplifier" in the diagrams means the main AC compressor, correct?

on it, is a plug called A8 (looking at the 5sfe diagrams). the harness goes from there to a plug called IM1 and then 3 wires go to the ECU's 1st plug. where is IM1 located ? is it the white, 5 wire plug that goes from the 3s hanress, and plugs in right behind the glove box?

This post has been edited by lagos: Jul 29, 2006 - 9:02 PM

[lagos]

ah ha! nice find.

i was looking at the AC specific diagrams and wondering why it wasnt there.

so it seams like there is a problem with adding AC idle up. on the 3sgte the idle up control is done by the AC amp.

in the 6th gen the AC amp dosnt have this function, because it is handled by the ECU.

so it seems there is no way to do it the way it is from the factory.

since the Idle up, only gets triggered when the AC clutch engages, i was thinking that maybe i can get it to work by splicing into the blac/white wire that supplies power to engage the cltuch on the AC compressor. this way, every time the clutch would come on (and make the rpm's dip down) the AC idle up would get 12v, and open its vac ports and make the car idle up. what do you guys think?

Yes, that's exactly right. The best thing to do is actually have the clutch wire go through a relay, and have the relay switch on a VSV. The only downside to this is that it will be on all the time, even when you're not at idle. It will work though, just make sure that one side of the VSV goes to the manifold and the other side goes to the intake behind the AFM.

Good job putting it together and congrats!

-Doc

no relay needed! and it wouldnt be on all the time. the AC clutch gets cycled on and off ever few minutes by the evap temp sensor. it dosnt stay on all the time. so 12v comes on and off to the clutch on the AC comp, while you have your AC on in the car . by simply splicing into that wire, the car would idle up at the same exact time the cluch kicks in, and idle back down to normal, when the evap sesnor cycles the clutch off. if your ac was off, then the car would act normal because the clutch idle up wouldnt be getting any voltage.

EDIT: ah i get what your saying. the Vsv would also engage while you are driving. i wonder how much this would really effect the car while its driving. since the AC comp only makes the motor idle at about 50rpm less then normal when at idle.

This post has been edited by lagos: Jul 22, 2006 - 9:18 AM