Air Conditioning Tech Thread.

[Rhyno]

True, if only the ARC people agreed hey?

[Tocchi]

does anybody have the vacuum "pinouts" for a mid 70s toyota aircon system?

the MS65 wreck i bought for parts had the early cable only version (about 5 cables) ... where as my current aircon (74 ms65) has both vacuum lines and 2 cables.
my crown is currently not blowing air where it should compared to the controls ... so i think the vacuum lines were put on wrong when i replaced them
ie: changing from hot to cold changes flow from demister to vents etc.

[thechuckster]

I'm fitting a universal condensor from my old MA61 into the RA65. While trying to keep bracketry to a minimum, i've ended up with the upper (and larger) outlet half-facing some paneling. There's about 2 inches from the end of the thread to the panel (one side of the radiator support panels).

Given that this fitting has the larger thread/hole, can I get fittings that makes a really tight radius?

The hoses that came off the Supra are no good, they only have a 45 degree bend.It would need to be a 90.

(sorry for no explainitory pics, is raining up here so shed it shut).

[Rhyno]

@ Tocchi, sorry mate can't help you on that one, might have to do some expermenting, swap the tubes around and see what happens etc. There should be a diagram out there some where, but I wouldn't know where to point you.

@ thechuckster - Yes you can. You should be able to go to Enzed or your local Auto AC shop and they should be able to sort you out. They will make a custom line for you... I imagine you will need to thread the elbow on to the thread and then install it to get the clearance you need.

[matty12]

A standard #10 90 degree is just about the 2 1/4inch mark from oring mounting to back of the ferrule/crimp. Its possible it may just fit, they are cheap about $12ish so you could always buy and see.

[thechuckster]

matty12: if I rock up to a pirtek, ask for a #10 to ferrule 90degree fitting to suit automotive a/c, they should be able to supply?

Or will I get the "brain buffer overflow, too many words, please try again" look?

Or should I take the condenser with me?

[matty12]

I honestly don't know if pirtek sells them, ashdown cool drive or even repco/covs do them. Your after a 90 degree # 10 FOR (female o ring) beadlock fitting. I can post a pic tomorrow if you need. I'm also a summing that its a dash 10 your after as most universal cond are a #10 and a #8 fittings. Otherwise take cond in and ask for a fitting to suit.

Does this work,
http://ishop2.cooldrive.com.au/image...?ts=1299190271

[thechuckster]

thanks matty, pic works. Will try to get pics of car today and post up.

[matty12]

it is a oring stlye condensor, not a flare at all?

[thechuckster]

yes, is uses o-rings.

[Tocchi]

@ Tocchi, sorry mate can't help you on that one, might have to do some expermenting, swap the tubes around and see what happens etc. There should be a diagram out there some where, but I wouldn't know where to point you.

managed to sort it out -- now i know the system back to front pretty much ... i've had starting issues with the car so i havent been able to try slight alternate path in the vaccum tubes (just to confirm i have the correct "pinout")... but ive sorted that so ill test the vacuum tubes within a week or so... and then ill do up a nice diagram/tech article for other MS65 owners to be able to have check upon if they have issues with theirs

[matty12]

No issues with the a/c itself since i charged her up??

[Tocchi]

matt, not that i know of, the change from Heater to A/C is instant (with either hot or cold) ... very happy.
i still need to put a pressure switch in place (as you recommended) but since i havent driven it much lately i havent got around to doing it yet (Which i should i know )

[Burgzz]

Your welcome Burgzz, glad to help. When you have it all done you should take a measurement of your ambient temperture and your vent temps for others to reference

Sorry its so far down the track that i did this, been so busy with tafe and been having troubles with the car.
But got i got it all fitted just before christmas, then it broke about 4 weeks later and took another 4 weeks to get fixed. What broke was the low pressure hose going into the compressor (what i paid someone else to do, ha)

Heres a pic of the compressor mounted.


Took a reading as best i could with mercury thermometer i had.

At the vents it was about 19 (this was at idle with the fan on medium)
In the car was about 21 - 22 (in the front seats)
Outside in the shade was about 29
Outside in the sun (where the car was) was above 41

[Rhyno]

Hey you can't rush perfection hey?

Installation looks good mate, very neat.

That a delta T of 20 degrees below ambient, thats pretty damn good!

One thing I would reccomend and will make your system a bit more efficent, is to wrap the metal joints of your cold line (Suction) with some insulating tape like this http://globosupply.com/index.php?mai...products_id=61.

Its not needed, but for the cost of $20 or so and the difference it makes on those mega hot days is worth every cent imho.