A/C was R12 then R134a - now what Hychill 30.

Vettech · March 15, 2019, 09:28:22 PM

Yes Ray, not all chooks are fledged the same.

Those baked lemon greek style spuds were great.

Vettech · March 16, 2019, 01:14:51 PM

Thank God for Google.

It appears the newer the cars the more sophisticated they are.

So after reading some more it appears that the short cycling may be induced by the ECM.
It detects low gas and goes into a rapid cycling phase to test gas level, to double check if low it will then not run the Comp so as to ensure the Comp is not stuffed.

This cant be changed unless the Battery is removed so as to reset the ECM. This is better than opening the system.
If it stops raining - I'll give this a go. stayed tuned.

BUT FRESHLY JUST ADDED.
A check of the car, shows the A/C controll head has a flashing light, interogation of the code indicates "09" - "Low Gas". Yes Yes Yes.....
Rain go away......

bfit · March 16, 2019, 01:47:30 PM

Quote from: Vettech on March 16, 2019, 01:14:51 PM
Thank God for Google.

It appears the newer the cars the more sophisticated they are.

So after reading some more it appears that the short cycling may be induced by the ECM.
It detects low gas and goes into a rapid cycling phase to test gas level, to double check if low it will then not run the Comp so as to ensure the Comp is not stuffed.

This cant be changed unless the Battery is removed so as to reset the ECM. This is better than opening the system.
If it stops raining - I'll give this a go. stayed tuned.

BUT FRESHLY JUST ADDED.
A check of the car, shows the A/C controll head has a flashing light, interogation of the code indicates "09" - "Low Gas". Yes Yes Yes.....
Rain go away......

I think your spending to much time alone with this car.
Bfit

Vettech · March 16, 2019, 02:37:11 PM

Maybe, I feel better now esp after a nice serve of Cabbage rolls with Lemon Tater for lunch.

Oh! NO NO NO a tow truck has just rolled up with the Boys Beamer on the back. Why me ?

bfit · March 16, 2019, 07:45:43 PM

Arrr the advantages of the benevolent father in-law
Bfit

Scott · March 18, 2019, 08:46:42 AM

The curse of being handy. (or competent)

Vettech · March 18, 2019, 05:19:07 PM

Incompetent is probably more correct.
Anyway Beamer needs new radiator, problem with cars with plastic radiator tanks, anyway a glue job should get me down to JENSENS.

Reset the vett, A/c working, put more gas in, went for a drive down to Picton. A/c worked fine.

See attatched pic.

BUT on way home A/c went off, once again exhibiting short cycling, indicitive of low gas, but gas is O K.

At approx time of failure went over a series of hard road join bump type thingo's. Ummmm 7km down the road after more bumps, I reset A/c and its fine.

Ummmm if it detects low gas, then it must be sucking down too far, maybe the bumps have dislodged muck into the Orific Tube, causes blockage.

Umm may have to bight the bullit, and open the system, chuck the Orific tube and replace it, flush the Evap with solvent.
Solvent is expensive, so maybe I'll relent and pay some one to do it.

MY081 · March 18, 2019, 10:34:17 PM

Picton should have called in . Free Beer !!!!

Vettech · March 19, 2019, 05:58:19 PM

Thought of you !

Now you tell me......

Vettech · March 21, 2019, 05:16:47 PM

Suspect Orifice Tube, so I degasses, found it, got it out.

See pic below.

Hard to tell colour, the colour means that the tube thru the centre approx where the "O ring" is located will have an Orifice.

Five sizes from 0.047 thru to 0.067" This looks black from the Oil and aluminium discolouration.

Not as much gunk as I hoped, but out now, so in with a new one.

Vettech · March 24, 2019, 06:21:17 PM

After my last post I was ready to burn it, however, it now has a new OTube albeit a 0.062" and it would appear that the original white GM Otube shoud be 0.072" anyway its in and regassed to what is calculated ˜340gms. BUT was still giving short sycles and "low gas alarm". AGAIN...

So today I decided the computer is correct - I'm ~~wrong~~ sorry not correct.

Put the gear on - ran up to temp, slopped some more gas in, now low side is ˜30psi and high at 180psi. (must be close to 400gms Hychill -30)

Compressor would cycle off at 22,5psi (normal R12 Pressure), now stays on, runs great - cool as ICE inside the cab.

Went for my test drive, stayed cool, it even rained so I could test the screen defrost.

HOWEVER this has highlighted the fact that even though the fan is screeming, the amount of air flow leaves a lot to be desired.

This can be left to a later date, but if anyone out there has a 90 or so C4 and could comment on the air flow - it would be appreciated.
These settings in the Mustang would freeze you, esp if you have the seat also switched on.

Except for all the forthcoming praise I suspect this topic is now closed. (fingers and toes crossed)

Vettech · March 24, 2019, 06:44:28 PM

Just when you thought it is over..

When I get back from the Nats - I can spend some time on the 87.

Because it is a mirror conversion, I may look for an early Commodore A/C package, from memory they look identicle but off course the unit is on the LH side.

My pet hate with conversions is the loss of "outside" air flow, maybe a Commodore unit will allow this feature.

Be good to get some clean air flow thru the car, esp to dry out and remove odours and moisture.

Regards

bfit · March 24, 2019, 08:25:49 PM

Sounds like a lot of latent heat to me.
Bfit

Vettech · March 26, 2019, 03:27:28 PM

Well just returned from a trip out west.

The car went great.

The A/C went even better - tested in all modes, all temps etc etc.

However the fan/air speed and flow will need attention.

Since this requires seat out, under dash pads out and person jambed head first up under dash, it can wait, I think its realy time now to enjoy the fruits..

The run to Qld will be the acid test, no failures will be a good recommendation of Hychill -30.

Regards.