Air con electrical issue?

Air con electrical issue?

Postby thebaton on Sun Dec 13, 2020 8:20 am

Having intermittent air conditioning issues, even on 28c days...air conditioning will be icy cold then go warm like it's just the fan that is on.

First step I had the air conditioning serviced, regassed. About a year ago I had the thermo fan added, this runs ok.

It can go warm even on a highway driving so it's not likely a blocked condenser or the fan etc. After the regas It still happened so I brought it back to the auto electrical and air con specialist. They reset something. This is the receipt:

Click to view larger picture

Can anyone make sense of this? Next step seems to be the dealer as mentioned in the note? what would they do? Replace the pressure valve and or thermostat? Could I just do that myself?
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Re: Air con electrical issue?

Postby WUNSIE on Sun Dec 13, 2020 6:52 pm

Thermostat wont have anything to do with the A/C, from what I can read they have done all they can within their capability and now are referring you to someone with a bit more knowledge and with the ability to check further
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Re: Air con electrical issue?

Postby RHKTriton on Mon Dec 14, 2020 6:45 am

With ETACS and other electronics in the vehicles these days, the autolec and fridges will only be able to do the peripheral diagnostics.

The dealers diagnostics will interrogate any modules involved at a deeper level.

First question I would ask is, have any more been done to the vehicle's electricals?
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Re: Air con electrical issue?

Postby thebaton on Mon Dec 14, 2020 1:10 pm

Loads, lpg system, mm automate, water methanol controller, Dakota Digital MFKSGI-5E to correct the Speedo and odo for larger tyres
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Re: Air con electrical issue?

Postby thebaton on Mon Dec 14, 2020 6:22 pm

And the battery has been moved to the tray
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Re: Air con electrical issue?

Postby RHKTriton on Tue Dec 15, 2020 6:40 am

Did your AC issue start anywhere around the time of fitting any of these accessories?

Anything hooked in via the odb port can affect your vehicle operation.

I had to stop using one of those plug in heads up displays, as it would intermittently cause a limp mode.
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Re: Air con electrical issue?

Postby thebaton on Tue Dec 15, 2020 6:45 pm

No but recently I was getting random errors using a Bluetooth odb thing with the torque app for data logging! I have almost all of those things installed over a year,some 3 years or more
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Re: Air con electrical issue?

Postby RHKTriton on Wed Dec 16, 2020 7:07 am

Just looking at your initial post.

Have you tried another compressor relay?

I've had relays over the years on headlights and fans that have intermittently either fail to operate or get stuck on.

You may have a compatible unit you could swap into the aircon position to test over a period.

Back to your other mods, I would disconnect where possible and reintroduce them one by one.
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Re: Air con electrical issue?

Postby thebaton on Wed Dec 16, 2020 10:25 am

I switched relays, yes , unfortunately didn't work.

I found a thermo fan for an additional oil cooler I added has had wires come loose. Suspect it happened recently. Will see what I can do with that on the weekend
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Re: Air con electrical issue?

Postby aids84 on Wed Dec 16, 2020 7:30 pm

Make sure the compressor clutch is cycling properly. If it's staying engaged all the time it will be freezing up the evaporator core, meaning no air flow through it.
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Re: Air con electrical issue?

Postby thebaton on Wed Dec 16, 2020 9:05 pm

Something's not right the full beam dash blue light was on at half strength while my full beams were off. Flicking the full beams on then off turneds the dash light off.
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Re: Air con electrical issue?

Postby RHKTriton on Thu Dec 17, 2020 6:53 am

I'm suspecting the issue is related to the ETACS.

Have you used one of those piggyback fuse adaptors to get a supply for an accessory?

As I've noted on other posts, these modern vehicles are loaded with electronic modules a d generally have one or more digital networks running in them. If you introduce an accessory that causes electrical interference or upgrade a device that that connects to one of these networks you can cause all sorts of "spooky" outcomes.

The high beam indicator could suggest something is possibly back feeding power where it shouldn't or you may have a more serious fault developing.

May be time to have a dealer hook up the ole Mutt.
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Re: Air con electrical issue?

Postby thebaton on Fri Dec 18, 2020 10:18 pm

Interesting, yes an installer used a piggy back thing for some guages
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Re: Air con electrical issue?

Postby macrider on Sat Jan 22, 2022 1:43 pm

Hello I have searched all forums for my air cond issues which has pretty much been ongoing for more than 12 months and taking it to various air cond specialists/auto electricians.

The ar cond in my 2012 MN Triton works well for the first 5-10 minutes before it starts to have this funny musty smell and starts blowing warm. I turn it off and leave it off for 10 minutes before switching it back on, starts working well blowing cold air before it carks it again 5-10 minutes later depending on the temperature outside. The hotter it is outside, the shorter the period of cooling before carking it. I must say that in the mornings when it is cooler than 22-23 degrees, the air cond works well indefinitely. It's usually when the outside temperature is above 24/25 degrees that the air cond does the abovementioned.

I have taken it to an air cond "specialist" who says it needed another 200grams of gas to top it up and that it is now working well and cannot visibly find a leak. A day later (today), on a short trip with the outside temp being 25 degrees the same issues are happening. The auto electrician also mentioned that if there is a leak, it would most likely be the condenser inside the dash and that if it is, the whole dash would need to come off to replace the condenser - a $1300 job.

I hope that the symptoms I have explained above are similar to anyone who had the same issues and able to advise the most likely cause and fix.
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Re: Air con electrical issue?

Postby DibbyDibbyDJ on Sat Jan 22, 2022 7:54 pm

Evaporator is inside the dash. I have never had to change one.
Condensor is in front of the radiator. I have changed loads of these because of leaks.

How much gas did he end up putting in in total?

Overfilling is just as bad as underfilling.

Did you get a pressure report? That would be helpful to diagnose
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