Jump to content
SAU Community

Aircon on R32 - No power but?

Strexx

By Strexx,
in General Maintenance

 Share

Recommended Posts

Strexx Enthusiast

Strexx

Posted
Posted

So I've had a hunt around these forums and can't really find an answer:

My AC control unit will not power up - well there is no LCD activity - in fact there is nothing, however - There is an aftermarket switch on the dash which does power the unit up - well the lamps/leds on the fan and the recirculate button illuminate.... and nothing else. The unit blows air and I feel that it was getting cooler at one stage but then it just blew warm - I will check the ambient temp sensor on the centre console to see if that is connected. At one stage when I pressed the Econ  button and then went back to the AC button, I could hear strain on the motor as if the AC pump had switched on but I could not replicate it all the time.

Are there any typical issues with the AC unit not displaying anything on the LCD panel?  What a fix?

I'd assume it needs a regas - but is there anyway to confirm?

Any advice would be appreciated.

Link to comment
https://www.sau.com.au/forums/topic/479160-aircon-on-r32-no-power-but/
Share on other sites
djr81 Grand Master

djr81

Posted
Posted

Well I reckon he has too but the three or four things I would start with are:

Check power supply to control unit and any other oddball modified shit someone may have done be it there or elswehere.

Change out control unit with a known good one.

Check blend door.

Check mode door.

Ofcourse that is assuming the Humphrey B Bear has refrigerant in it and the compressor etc goes round.

GTSBoy Grand Master

GTSBoy

Posted
Posted
9 hours ago, Strexx said:

Hey is possible to buy a kit to regas your own AC or do I need to have it done?

How can you check to see if you need a re-gas?

No, you can't. Just take it to an air-con shop and get it checked and/or fixed. But note that they cannot do it unless it is actually a working system! You need to be able to run the compressor to check the system pressures. If there is no gas, then your pressure switch will keep the compressor from starting, but you sound like you have a lot more work to do first.

Strexx Enthusiast

Strexx

Posted
  • Author
Posted

I had a win and got the AC head control unit working again - So there was no activity whatsoever of the control unit - No LCD and the buttons worked occasionally but you never got feedback to know what the buttons were doing. So I pulled the centre console out and then pulled the AC control out and spent ages trying to pry out the cable connectors at the rear with no success. Simply could not get them out of the unit.  So I stuck it back in and then proceeded to remove the stuck on facade.. This was stuck on with double sided tape so I gently eased it off. There were then three screws to remove in each corner - with these removed and a little prioring of the clips around the edge, the front LCD display and circuit board pops off.  Where the horizontal circuit board join the other LCD vertical  board - there are about 20 pins that slot into the board to make contact.   These were simply corroded or tarnished enough that there was no connectivity. I gently rubbed the pins with some very fine wet n dry - You could see the dust/corrosion coming off in the sunlight - I sprayed them with some electrical contact cleaner and put the two boards back together screwed it up and turn on the ignition to test and hey presto all the LCD came alive and every button cycled through it expected mode - So I put the centre console back (Saw the radio retro fit which was shite - but I'll fix that up next) In changing modes the levers move and open close the door actuators & blend doors - they are bit stiff and make a groaning noise but they all seem to work as expected. It heats and I'm sure the AC needs a regas for cooling - but it works as expected. I hope that this helps some one else with a fix.

  • Like 1
  • Thanks 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • The Bogan
      NC MX5

      By The Bogan · Posted

      I have more than enough digging, laying blocks, moving gravel, airrating, feeding and top soiling the grass, and setting up the veggie gardens growing some seedlings,  and then removing all the unused rock to keep me busy for the next few months at least,  hopefully the rain stops soon so I can get a few hours in this arvo, but, before that Sunday is washing day, is every body happy, you bet your life we are Nice country road day drives are a day off whenever I'm muscle sore from all the landscaping at the moment, but, more epic multiple day drives will start once the majority of the big jobs outside are completed
    • MBS206
      NC MX5

      By MBS206 · Posted

      I hear that would involve some nice country road drives into the hills for Mark...
    • MBS206
      Recommendation for engine oil funnel spill free

      By MBS206 · Posted

      I thought I'd come back and add something I JUST learned. A Toyota LandCruiser with a 1HZ, mates perfectly with a bottle of Nulon brake fluid. As in, it perfectly screws in. Great make shift funnel when you cut the bottom of it off. This may work for your Corolla.   Unfortunately, tipping a 10L drum is much harder than a 4 to 6L bottle, and they no longer include the easy pour tap which was just perfection to use previously.  
    • EndZee
      Fuel Pump Control Module & Dropping Resistor

      By EndZee · Posted

      Guys since i bought r33 gts25t coupe 1994 automatic a/t(manual swap 350z gearbox)  all i got is problems, always problems. Lets start with that when i turn key into ignition(ON) fuel pump doesnt always works. Sometimes i have to turn key twice Off/on/off/on until it primes. Its new, dw300 - 340lph. My gearbox broke so i did gearbox swap, install different intake manifold, injectors and i take pipes. Car was sitting in garage for more than half a year. I did assembly all not that long ago and when i turn ignition cant hear prime. All of sudden it stopped working. Theres many videos on YouTube how to make relay mod on r33 straight from battery so i did and it doesnt work! 😰 30 - battery positive  87 - positive from fuel pump to relay 85, 86 - one of two wires from original fuel pump wires(light blue, grey) and it didn’t work. so I check on ignition and took original BLUE relays wires from trunk, next to fuses. (I believe it’s IGN+ and ECU pin 18. it didn’t work…  tried connecting (IGN+ from og relay) and (ECU 104 from 1of4 FPCM wires) to my new relay 85/86 and it didn’t work.  I unplug FPCM. Didn’t work. im thinking what’s wrong   fuel pump is working, if I leave IGN+ on 85 and 86 straight to ground it works but it’s just nonstop. Since it getting constant 12v after key in ON. light blue wire gives me 6-8v.  so how this should be connected? What causing ECU not giving — on pin? Or I did sth wrong and that’s why it doesn’t work? I need negative signal on ECU that control fuel pump. What this should be?
    • Duncan
      M35 Brake caliper replacement

      By Duncan · Posted

      You can use your VIN to look up the factory part number somewhere like amayama, and then look to order new if necessary. https://www.amayama.com/en/genuine-catalogs/nissan Depending on price you might want to rebuild instead. @GTSBoy I had an interesting insight into US market parts when the Titan rear calipers were sticking. New calipers were dirt cheap, about 20% more than a rebuild kit....they are just considered throw away maintenance items
×
×
  • Create New...