Author Topic: A/C was R12 then R134a - now what Hychill 30.  (Read 644 times)

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Offline Bfit

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Re: A/C was R12 then R134a - now what Hychill 30.
« Reply #24 on: March 16, 2019, 07:45:43 PM »
Arrr the advantages of the benevolent father in-law
Bfit
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George Orwell 1984

Offline Scott

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Re: A/C was R12 then R134a - now what Hychill 30.
« Reply #25 on: March 18, 2019, 08:46:42 AM »
The curse of being handy. (or competent)

Offline Vettech

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Re: A/C was R12 then R134a - now what Hychill 30.
« Reply #26 on: 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.

 :grr:
Vettech.

Offline MY081

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Re: A/C was R12 then R134a - now what Hychill 30.
« Reply #27 on: March 18, 2019, 10:34:17 PM »
Picton should have called in . Free Beer !!!!

Offline Vettech

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Re: A/C was R12 then R134a - now what Hychill 30.
« Reply #28 on: March 19, 2019, 05:58:19 PM »
Thought of you !

Now you tell me......
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Offline Vettech

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Re: A/C was R12 then R134a - now what Hychill 30.
« Reply #29 on: 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.
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Offline Vettech

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Re: A/C was R12 then R134a - now what Hychill 30.
« Reply #30 on: 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.

Offline Vettech

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Re: A/C was R12 then R134a - now what Hychill 30.
« Reply #31 on: 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
Vettech.

Offline Bfit

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Re: A/C was R12 then R134a - now what Hychill 30.
« Reply #32 on: March 24, 2019, 08:25:49 PM »
Sounds like a lot of latent heat to me.
Bfit
Freedom's just another word for nothin' left to lose
George Orwell 1984