Aircon And How To Fix?

[GH05T]

ok so the car in subject is a 1989 32 gtst

aircon dosnt work, need a bit of guidance from someone who knows more about electrics than me so i dont have to tip too much money into it

but must fix before summer hits!

ok so i have had the system re gassed with dye to find the leak, no leaks yet but the system is not yet operational. i assume i will have to replace something but thats the easy part.

the problem is my compressor and thermos are not switching on. i can hotwire it from the battery and switch the compressor on though so it does work.

i have had the pressure switch checked and their was another switch checked i think and that side of things work. i assume now that my aircon headunit itself has something broken in it, i was thinking next to just replace it and hope for the best.

is their something else electrical in the system though that i need to look at, or have looked at?

also does anyone have a wiring diagram for it?

[Sinista32]

Hey Glyn, do you have an aftermarket ECU ?

Quality units like Haltech or Vipec, there is a setting in these that can prohibit AC.

Likely not your problem but worthwhile being aware.

Also i seem to remember you can get a daig code out of the AC headunit.

Worth searching the forums for.

Obviously checked fuses ?

[Sinista32]

Just found many threads but this was in one of them.

Climate Control Diagnostics R32

The climate control has a diagnostic mode.

Enter the diagnostic mode by pressing the OFF button for five seconds within ten seconds of turning the ignition on.

Sensor check

Sensor check is selected by pressing HOT switch (the red triangle) while in diagnostic mode. The microcomputer detects whether each sensor input signal is within correct parameters. The results are displayed on the screen.

If normal, a "20" is displayed.

If abnormal the failed sensor number is displayed. The sensor numbers are as follows:

20 - all is normal

21 - outside air sensor

22 - Inside air sensor

23 - Water temperature sensor

24 - Intake temperature sensor

25 - Sunload sensor (small sensor on the left hand side of the dashboard near the windscreen)

26 - PBR

27 - Refrigerant temperature sensor

This should tell you if any of your sensors are faulty

Link:

http://skylineowners...thread.php?t=47

hope this helps.

[GH05T]

yeah i came across that a while ago, all was normal so the sensors seem to be working,

also side not i was wandering what 25 was... saw it the other day and i saw the electronics when the sun hit it and was thinking some model had auto headlights

all fuses are fine yup, and i have a nistune board, doubt that would do anything?

[GH05T]

my sparky at work said he wanted to test all connections on the back of the unit and work backwards from their but thats allot of time and money, would be faster with a wiring diagram.

[Tommy Kaira RL]

Here you go hope this helps.

Just start checking to see if you have 12V going around the circuit for starters

[Luke_ENR34]

I've got 22 and 25 flashing on mine . Now to find them.

[Tommy Kaira RL]

22 would be where the little vent near your left knee is. There is a tube that feeds back from behind the vent

[GH05T]

Fixed mine, turned out that the ecu was holding it back.

The ecu has a few states which it wil turn the ac off, most are safety related, but one of them is when you want full power out of your engine it will quickly switch the compressor off to minimise the draw.

I suspect when the nistune went in this was altered or something, mine was keeping that switch off. We rewired this so it listenes to the ac head unit not the ecu on that one. And bam Crispy cold air ready for summer

[Sinista32]

Chillin - good stuff

[GH05T]

im gonna hyjack my own thread here,

i have found that my car idles dead smooth with the new ac on, was a little hickupy before, always was......odd.....?

[aaronjod]

I have this same problem. I don't have a his tune, just a stock ecu. I did notice one of my ecu wires has been cut and rejoined, should I be investigating?

I also have idle issue like you... Please explain what you did!

[GH05T]

nothin lol,

im shit with electrics, i just gave the ac wiring diagram to my sparky and he fixed and rewired.

[AnDyStYLe]

Hmmm does a Power FC do the same and prohibit the air con?

I haven't had air con for about 2 years now

When I first tried to fix it, I believed that it was a faulty compressor, which I had that replaced for a 2nd hand unit. Got the gas refilled, and thought I got the air con to work again as it was icy cold on the way back from the air con workshop, but after 15 odd so minutes of driving it never stayed cold and the air was like the temp of a normal fan.

I've been thinking that it's been the 2nd hand compressor all along, like maybe because it was 2nd hand the seals were brittle and cracked, so it leaked again. Never thought to take it back as I didn't want to spend more money recon'ing the thing.

But with this thread coming to my attention, could I be off the right track, and in fact it could be linked to my Power FC?

Sorry to hijack lol, but it's all relevant!

Cheers,

Andy

[GH05T]

well we hot wired the compressor which showed it worked. we just didnt know why it wasnt turning on by itself

[vorse]

out of curiosity is that diagnostic code the same for a 32 gtr?

[vorse]

answered my own question it is page 730 of the service manual