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Air Cond Power Wire ?? Where is it??

Jay95R33

By Jay95R33,
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Jay95R33 Grand Master

Jay95R33

Posted
Posted

Just wondering if anyone knows where in the engine bay of a R33 GTS-t I can find the power wire for the air con?

I need to tap the wire of the air con that has 12v only when the air conitioner is turned on.

There is a relay in the fuse box under the bonnet makes A/C, but it has constant power as soon as the ignition is turned on, and I need it only when the A/C is turned on.

I want to wire up the front fan so it turns on as soon as the A/C is turned on.

Thanks

J

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wrxhoon Grand Master

wrxhoon

Posted
Posted

there should be a plug that plugs on the compressor ( 2 pin i think ) u maybe able to see it from under the car or put u r hand from under the car and try to feel it . if i remember right its on top , if u take the airbox off u 'll see it i'm sure , if u cant find it let me know and i'll have a look in the gtr and post back .

how come u want the fan to go on when the air is on ? not necessary on the skyline cause u have a clutch fan , unlike front drives that have electric fans . isnt the air cond efficient ? or does the car overheat ?

Jay95R33 Grand Master

Jay95R33

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  • Author
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Cool - thanks.

I had a quick look at a mates R32 GTR from under the car but couldn't see the plug, but I'll have a good look around mine on the weekend, and rip the air box out etc.

I got rid of the clutch fan, and now I'm running a DC16 incher that's thermo controlled by a temp probe in the radiator.

I've heard stories of the A/C over presurising when you ditch the clutch fan for a thermo controlled fan, hence why I want to do this mod.

So to stop the A/C over heating/pressurising I'll make the front fan come on whenever the A/C is turned on.

And with summer on the way I dare say that the A/C will get a good workout :D

Cheers

J

wrxhoon Grand Master

wrxhoon

Posted
Posted

if u have a thermo electric fan its a must that the air cond fan goes on when u put the air on , cause the thermo fan only goes on when the engine gets hot and for a very short time .

Jay95R33 Grand Master

Jay95R33

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Woohooo - I worked it out.

OK, forget about the relay under the bonnet that's marked A/C. It might be for the A/C, but it's not switched with the A/C !!

The wire that is switched when you turn JUST the A/C on and off is pin number 5 on the FICD relay under the bonnet.

I have no idea what FICD stands for though !!!

Just to confirm, pin 5 of the FICD relay is only turned on when you turn the A/C on. If you only have the heater on and manually turn off the A/C (by pressing the A/C button after you've pressed 'Auto'), then the pin is held low (no voltage on it).

But as soon as you hit that A/C button, and A/C lights up on your headunit, then pin number 5 on the FICD relay has 12 volts on it.

I hope that helps someone.

J

Cubes Grand Master

Cubes

Posted
Posted
I hope that helps someone.

Yep.. It sure did.. I've got 2x DC12's on my 32.

What have you done about the coolant temp switch thing that is plugged in to the bottom of the radiator. This is origionally what used to control the on/off for the overheat fan that is in front of the condensor?

I am going to see if i can get a cooler temp switch that will then activate the thermo's through a set of 2 relays.

Currently the two thermo's are running off 1x30amp relay. The power wire from the battery gets warm and began melting the wire once. Hence the reason for 2x relays in the future.

Jay95R33 Grand Master

Jay95R33

Posted
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G'day Joel - how you been?

Cool, yepp. What I've done is used a single poll double throw relay, so when the A/C is off the front fan operates as normal (eg. off of that temp sensor in the bottom of the radiator).

But once the A/C get's turned on, the fan is cut from the circuit (so the ECU doesn't get confused (not sure if it would though)) and power is applied to it to turn it on.

Hay I noticed the same thing with my DC fuse holder. It was getting warm and was starting to melt !!

Matt (whatisname) has had the same problem, as well as a mate of mine (I had to replace his last night !).

Do what I did, go down and get a good quality fuse holder that can take 40amps and uses 10ag wire. Then you shouldn't have any problems...

I had the DC16 incher I've got on the bench to see what sort of current it draws, and OMG !! On start up it peaks to around 31 amps !! then settles on about 19 amps once it's upto speed !!

Good idea about getting a lower temp sensor.

I was worried about the A/C over pressurising and doing some damage :D

J

Cubes Grand Master

Cubes

Posted
Posted

I've got a wiring diagram for the R32 so I'll try to see what else that temp sensor switch is used for.. I.e if the ecu retards timing when it detects an overheat.

Yer my Fuse holder also melted. :)

I might have to see what two DC12 thermo's draw when starting up and once up to speed.

They do suck some air though as when I put my hand in front of the condensor i can feel the air being pulled through my fingers.

I might be poping up to Canberra over christmas.. Maybe.. If I do come over I'll have the RB30 in it by then.

Jay95R33 Grand Master

Jay95R33

Posted
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Posted
Originally posted by -Joel-

I might be poping up to Canberra over christmas.. Maybe.. If I do come over I'll have the RB30 in it by then.

Cool - yepp for sure. I'd be real keen to check out the conversion.

Drop me a PM if your gunna come over.

J

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