Ke70 Aircon

[turbo_rolla]

Hey guys, did a 4age conversion on my ke70 at the end of last year and finally got around to getting the aircon redone (new pipes, gas etc - had factory aircon prior to conversion that worked fine). Spoke to the guy who did it and he said that they tried it after it was finished and it worked fine (car running, then a/c turned on). They had to turn the car off, and after they restarted it they couldnt get it to go back on. They said they COULD look into it, but suggested it might be an auto elec job. They said they looked at the fuses in the kick panel but nothing appeared wrong there.

 

So basically:

 

* swithced it on first time, and it worked

* turned car off

* tried to switch on again, didnt work

 

Is it likely this could just be a fuse or relay related to the compressor? Had a look at the wiring diagram, and it looks like there is an "inline" 10A fuse for the a/c, but can't work out where this would be? Am going to have a closer look tomorrow, but any help would be appreciated!

 

Also, should i hook up the "a/c amplifier" part of the 4age ecu now its back up and "running"?

[turbo_rolla]

Alright, had another look over my haynes book this morning (page 12-3) and it indicated that the "air conditioner relay" was in the relay block near the battery. Checked this, and it only looks like there's a "main relay", a "headlight" relay and a few fuses, no aircon relay (on the inside of this cover it mentioned something about an "optional" a/c relay). Checked the fuses in the cabin and couldnt find anything, so I'm no-where near being closer to having cool air?

 

Am i able to test it to see if it works by hooking it up directly to the power source? (ie battery). Getting to the stage that it might go to an auto elec, but any help in the meantime would be appreciated (ie a photo of your relay block near the battery if you have a/c in your ke70).

 

Thanks :D

[turbo_rolla]

just realised this should be in "car electrical", so could mods please move there? Thanks

[turbo_rolla]

alright, had a fiddle around with it with my mate this arvo and we ended up running a wire from the battery to the a/c plug, and it ran, which was a good sign. So, there's something f$#ked up between the button that turns the a/c on, and the compressor. So going to look at it a bit more tomorrow. May just have to wire a new switch in, but will see!

[turbo_rolla]

bit of an update, despite the lack of interest :D Traced the wiring from the actual a/c switch in the cabin, part of which went back to the amplifier. The wire coming out in the engine bay was black with white, so located that (indicated on diagram below in green). Chopped the black/white wire before the connector (3pin) shown on the diagram, and wired it directly to the magnetic clutch wire (with 10A in line fuse).

 

 

TUrned it on, and hey presto, magnetic clutch engages and cold air comes through :D Joined up all the wires properly (had only twisted them together as i didnt think it'd work! :y:).

 

Tried it again, and it worked still. for a while, then coughed and spluttered and eventually died? :D was resigned to the fact that it is just f$#ked, and put everything back together.

 

Thought i'd reset the positive terminal on the battery just to see if that made any difference, and tried again - back on she goes :hmm: Gave it some revs, and the compresser engaged again. So i got to thinking that it needed some RPM to keep it going. Went for a drive around the block and nothing again? Got back, switched it off, then on again, and gave it some revs and it engaged once more. When i let the rpm drop off back to idle it died, but then went back on as soon as it got some more RPM.

 

So, basically the question is, is there anything in the system that i need to hook up to let the ECU recognise the a/c is on and keep the revs up (maybe the a/c amplifier wire on the ecu harness??), as I'm guessing it needs a certain RPM to keep it going? Guessing this is why it worked when i started the car (ie high idle while cold), but then stopped after it had warmed up.

 

Again, any assistance in the matter would be appreciated!

[turbo_rolla]

Due to the overwhelming interest this thread has created, i thought i'd update all with the happy ending! :y:

 

Had a look over the AE86 manual, and found at page AC-29 the following:

 

 

I remembered seeing this little knob when i was checking out the wiring, and thought about it but decided it couldnt be what was wrong. Anyway, was reading this page about 30 minutes ago, so went out to the car to try it out. Turned car on, ran aircon, and it slowly died off as it had been. Twisted the knob (clockwise i think, even though it says counter-clockwise in the book) to increase the RPM cut-off, and the compressor came back on. Went for a spin around the block and it stayed on. Also adjusted my thermo fan so that it comes on fairly cool to draw some more air through the condensor, but will have to do another fan on the condensor also i think (or 1x 16" with a bit of an enclosure between the condensor & radiator). So probably didnt have to do that re-wiring i did, but all is good now! :P

 

So, it would appear that the following may be concluded:

 

If you do an engine conversion, and your airconditioner cuts out at idle, its because this little screw needs adjusting. It can be found on the "a/c amplifier (the a/c amplifier is actually a cpu card of sort, enclosed in the small plastic box with the knob and plug on top), and will give you nice cool air again! :) :dance: :dance: :yes: :yes: :yes: :dance: :dance: :dance: