Air Conditioning Tech Thread.

[matty12]

Just reading the local workshop mag, VW Daimler Audi BMW and Porsche are turning away from the new hydrocarbon gas 1234yf with concerns over flamabilty of the gas. They are looking at using CO2 as the new gas. Very interesting.

[Rhyno]

Bikplaboi, have a good read through this thread and you should have all the knowledge you need
. Just rememeber with most things in life, cleanliness is close to godliness.

Very interesting Matty, if they do will be interesting to see how they do it. Probably a huge condensor as I recall c02 having very high heat rejection from memory - but never worked on a co2 system ever

hmmmmm

[matty12]

Yeah i know nothing at all about co2, didnt even know you could use it. I tell you what though, they better hope they using existing co2 rather than produce the stuff from scratch, all the atomsphere needs now is more of that shit. End greeny rant!!

[Rhyno]

Ha Good point!

[maccac__1590]

co2 needs monstrous pressures, steel braided hoses and the whole works, heard stories of testing and they poped a few lines and total destroyed all manner of stuff in the engine bay, which might scare them off a bit too


edit: also word or warning for those running hychil and other flammable refrigerants, i recently did a a/c course at work and the bloke they got out to do it, Grant Hand from ATS (anyone done his course too?), was saying that there was the first case of someone being charged for using a flammable refrigerant, i cant recall exactly what happened but someone got burn or hurt somehow and they charged someone for using a refrigerant in a a/c system that was not designed for it, ie hydrocarbon's in a 134a system, so if you are running it and you do stack it and they deem that it was a contributing factor to someones injury's or something they will try to pin you for it, and now on a lighter but still half serrious note A video of a hydrocarbon refrigerant demonstration which wen - YouTube (hard to understand some of the talking but worth a watch, funny as fuck at the end)

not trying to scare anyone off too much, its you car you can do what you like, but worth keeping in mind

[dnegative]

Its legal to use, doesn't matter in a car.
Issue with industrial situations when your charging a system with 200kg of refrigerant etc

[maccac__1590]

Haha yeah 200kg would be a nice bang haha, in a car its probly the same class as cut springs and a welded diff which I can be guilty of myself haha

[thechuckster]

Can anyone advise what brand/kind of oil to use when re-assembling a compressor?

Will be going into my GT4 which was already running R134a (until the compressor decided to turn the seals into custard).

I've got a o-ring/seal kit (from Century Auto Air in Arizona - were cheaper than anything I could find in Oz, and they were super-fast at delivery) but couldn't get oil from them as there was no way it could be sent via post/airmail. Their website suggests that PAG oil is what they use in R134a systems tho Mineral Oil is advised for assembly-only use as well.

Problem I have is rocking up to my local Bursons's and asking for a/c oil and they then ask - what viscosity? what brand? - at which point I have to admit that I have no idea.

[maccac__1590]

i would imagine its a denso compressor being toyota so maybe one of the denso oils? or just use ester if your lazy like me haha

[2jzhilux]

Get some nd11 oil from toyota.
Will come in a little tin.

[Z2TT]

68 Vicosity will do most of the time, such as PAO68, it's a Synthetic oil. Which compressor do you have?


Maccac, Grant Hand is an associate of VASA, an organization that has been spreading Anti-HC propaganda since the early 1990's as-well as some other ridiculous claims.

Notice in that video they used instruments to deliberately dial in the most potent mixture plus they mentioned they will use 2 cans, that is more refrigerant than that Charade would ever hold.

To backup his claims of "System it was not designed for" you should ask Grant to provide evidence and technical explanation to back up some of the claims on VASA's newsletters like :

- Hydrocarbons cause poor oil return because only 1/3 of the amount of refrigerant is used

- Hydrocarbons won't work with variable displacement compressors.

- Pressure switches have to be bypassed in some cars to work with Hydrocarbons

- Denso issued a warning that serious component damage will result when using HC's

[maccac__1590]

yeah he did go into a bit of that stuff but was too long ago to recall exactly haha, but yeah he was defiantly dead against it, and i do recall some stuff about the lack of oil return and the variable compressors and pressure switches which even with my knowledge using Hydrocarbons wouldn't effect these things bugger all. i never took too much notice of the video just that it went bang and messed old mate up haha, but yeah re-watching it they definitely could have done a better test. sorry if poked a nerve haha i just thought it would be worth a mention thats all

[thechuckster]

68 Vicosity will do most of the time, such as PAO68, it's a Synthetic oil. Which compressor do you have?

Compressor is a Denso 10PA15 from a gen3 3SGTE.

Cheers,
cDv

[PrettyCoolWagon]

Hi guys,

car: AE95 4WD Corolla 4AFE EFI same as a lot of the AE9x series cars in terms of the a/c set up.

Just got it re-gassed however compressor clutch won't engage & A/C button isn't illuminating on the dash board when pressed. So I'm thinking break in the circuit somewhere.
Really don't know much about electrics but I do have the Toyota AE90 series electrical & body books.

Any tips on where I should start trouble shooting?
Puled all the plugs/fuses etc. in the little triangular fuse box in the engine bay marked "A.C." All seemed good and clean.

Plan on taking it to my old man's, on Sunday to go over it with a test light or volt meter.
I'm not electrically minded (yet) so any tips / methods of elimination will be helpful.

Also for anyone who knows these E90 cars, I had the engine out not long ago to fit a new clutch. There's 2 electrical plugs in the base of the radiator on the driver's side. One's plugged into the loom, the other, (closest to the belt and pulleys, I wasn't able to find a plug in for. So I've coiled it and zip tied it for the time being - car seems to be running fine, ..But the lingth of wire attached to the plug tells me it's likely I've missed something, ..just can't seem to find anything though..
If anyone has an E90 chassis and could check if this is an extra wire that doesn't get used or if I've missed something that'd be great.. Photo would be awesome.

I'm reasonably confident this has nothing to do with the A/C compressor though, because the A/C comp has 2 wires attached already. Plus the light on the A/C dash button stopped working long before I had to service the clutch.

Cheers. Jed

[2jzhilux]

Where is a good place to buy a/c lines to run a condenser to the back of my ute.
Should I also increase condenser size due to it being further away and under the tray if I have a decent set of thermos on it?