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Thread: Air conditioning not cold

  1. #1
    Join Date
    Feb 2013
    Location
    Gosford, NSW, Australia
    Posts
    2,398

    Air conditioning not cold

    Hi

    I have an issue where my Air con has decided not to get very cold. Last Saturday the exit pipe from the compressor was very cold and had condensation on it but now it's decided to not get very cold

    The compressor clutch is engaging and I am 99% sure it has plenty of gas.

    I read on rr.net that it could be the Tri-state switch. There is also some kind of pressure switch on these earlier models.

    As far as I can tell the expansion valve might be the culprit as well.

    Anyone got any ideas before I start throwing money at it !

    Steve
    MY96 4.6 HSE P38. Niagara Grey; "The Phoenix"
    MY99 4.6 HSE P38. LPG, Blenheim Sliver; "Voldemort" burnt to a cinder
    MY79 RR Classic, Gone, MY57 Series 1 SWB, Long gone
    P38 write ups and info on my website http://p38.hts.com.au/

  2. #2
    Join Date
    Nov 2015
    Location
    Melbourne
    Posts
    126
    Hi Steve, one or more of the blend motors may be part of the problem. But with a 20 year old aircon system it could literally be anything or a combination of problems.
    My advice would be to get it diagnosed with a test unit to see what fault codes it throws up.
    2013 D4
    1993 LSE HS2.8 (in hospital)
    1966 Army engineering trailer
    1976 SIII diesel tray (farm ute)
    (previously SII 2.25 swb, SIII 2.25 swb & lwb, P38 Vogue)

  3. #3
    Join Date
    Feb 2013
    Location
    Gosford, NSW, Australia
    Posts
    2,398
    Quote Originally Posted by DieselLSE View Post
    Hi Steve, one or more of the blend motors may be part of the problem. But with a 20 year old aircon system it could literally be anything or a combination of problems.
    My advice would be to get it diagnosed with a test unit to see what fault codes it throws up.
    I am thinking along those lines as well

    I have replaced all the hoses and the condenser and receiver drier about 9 months ago, so I know some parts are good

    It's not showing any codes in the nanocom, so perhaps it needs to be hooked up to a more specialised machine

    Thanks
    Steve
    MY96 4.6 HSE P38. Niagara Grey; "The Phoenix"
    MY99 4.6 HSE P38. LPG, Blenheim Sliver; "Voldemort" burnt to a cinder
    MY79 RR Classic, Gone, MY57 Series 1 SWB, Long gone
    P38 write ups and info on my website http://p38.hts.com.au/

  4. #4
    Join Date
    May 2010
    Location
    Mullaloo, Western Australia
    Posts
    1,076
    Steve

    I am also of the opinion that professional help may be needed here. The trial and error method can get very Costly! The fact that you state that the condenser is not getting cold I would have thought lack of pressure. Thanks A/C specialists can do a these for gas. It may be a leaking hose are any other component as far as that goes. The clutch is engaging but is there any chance it could be slipping? If you have any spacer shims on q the clutch you could try removing one and see if it rectified the problem. Other than that seek professional services.

    Good Luck!
    Gary

    1996 p38a HSE
    2" lift, Gen3 bags, adjustable Off Road Boss shocks, adjustable panhard rod, adjustable sway bar disconnects, EAS bypass, Ashcroft ATB F&R, 255/55/18 Toyo Proxes ST for road & 265/75/16 Maxxis Big Horns for off road :)

  5. #5
    Join Date
    Apr 2010
    Location
    Lower Hunter Valley NSW
    Posts
    311
    Well what a coincidence. I bought some 2nd hand HEVAC servo motors from pommyland, a TX valve from work and some Hychill minus 30 from Bursons.

    I'm halfway through the job with some emergency home made heater core orings (tested 100% OK) and fitting the dash back in.

    Mine had the same symptoms as Steve and it was low on gas as I had a leak in the evaporator. It was a very gradual decline with that pungent stink from the air con oil coming through the vents.

    I'll report later on today.
    Current: MY99 Range Rover HSE with 5.0L V8
    Past: MY01 Discovery V8 - drowned , MY03 Discovery HSE V8 - sold

  6. #6
    Join Date
    Apr 2010
    Location
    Lower Hunter Valley NSW
    Posts
    311
    Well I can say that the re gas was a success! This Hychill stuff is very much like the old R12, I've never had a later model car with such cold air before.

    Sorry for the slight hijack Steve.
    Current: MY99 Range Rover HSE with 5.0L V8
    Past: MY01 Discovery V8 - drowned , MY03 Discovery HSE V8 - sold

  7. #7
    Join Date
    Mar 2015
    Location
    Townsville at the moment
    Posts
    15
    Hello Steve
    If your problem was in the control system i.e. Trinary (tristate) switch the clutch would not be pulling in. Are the condenser fans in front of the radiator running? Is there air coming out of the vents? Is the dreaded A/C symbol displayed on the A/C control panel.

  8. #8
    Join Date
    Jan 1970
    Location
    watch this space.....
    Posts
    12,550
    Something's not right if the clutch is pulling in and the suction line isn't cold and sweaty.
    At the same time the liquid line should be a bit above ambient and the discharge line too hot to touch with a few revs on the engine, fan set at high.

    You need someone qualified to put gauges on and see what's happening. Without them you are blindly guessing.

  9. #9
    Join Date
    Feb 2013
    Location
    Gosford, NSW, Australia
    Posts
    2,398
    Thanks for the comments everyone, we had a good look around all the wiring etc and there is nothing which appears to be out of place.

    Definitely time to get a professional to look at it. It was cold one day and not the next, in typical P38 fashion it decided to wait until the weather got really hot before it stopped playing !

    Steve
    MY96 4.6 HSE P38. Niagara Grey; "The Phoenix"
    MY99 4.6 HSE P38. LPG, Blenheim Sliver; "Voldemort" burnt to a cinder
    MY79 RR Classic, Gone, MY57 Series 1 SWB, Long gone
    P38 write ups and info on my website http://p38.hts.com.au/

  10. #10
    Join Date
    Feb 2013
    Location
    Gosford, NSW, Australia
    Posts
    2,398
    Quote Originally Posted by JohnnyB View Post
    Hello Steve
    If your problem was in the control system i.e. Trinary (tristate) switch the clutch would not be pulling in. Are the condenser fans in front of the radiator running? Is there air coming out of the vents? Is the dreaded A/C symbol displayed on the A/C control panel.
    Hi Mate

    Yes all those things are working it correctly, I do have the chequebook symbol but that is the left hand reticulation motor (the fresh recycled air one)

    Regards
    Steve
    MY96 4.6 HSE P38. Niagara Grey; "The Phoenix"
    MY99 4.6 HSE P38. LPG, Blenheim Sliver; "Voldemort" burnt to a cinder
    MY79 RR Classic, Gone, MY57 Series 1 SWB, Long gone
    P38 write ups and info on my website http://p38.hts.com.au/

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