AC Expert question

[Subfixer]

Here's my latest question:
The 94-95 134a AC compressor mating flange has a "step" on it.
The compressor hose assembly mating surface is flat.
There are no o-ring grooves in either surface.
What combination of o-rings are used, or is there a different sealing mechanism as opposed to the older R12 system?
Thanks, Paul

[-=Jeff=-]

Pictures? I am trying to picture it and just can’t...

[Subfixer]

Here's a pic of the compressor and it's mating hose assembly.
The surface of the compressor flange is machined lower at the discharge side. That's the port on the right in the picture.
The hose assembly is flat across it's face.

[-=Jeff=-]

Maybe a thinner o-ring would work?
I would think the groove is missing on one of them. Maybe email Haibeck with the pictures to ask the same question

[Subfixer]

I talked to Mark today, and he was just as puzzled as I am. He hasn't worked a 94-95 in some time and could not recollect what the compressor hose flange should look like. He was pretty sure this hose was built with the wrong 90-93 compressor flange and 94-95 hoses.

If there is anyone out there that could get a picture of the 94-95 mating surface of the compressor hose assembly, like the right picture above, it would be much appreciated.

Thanks,
Paul

[-=Jeff=-]

The few images I see are of the hose assembly and there is an o-ring and it looks like it is not in a groove. My guess is the compressor has the groove.

[Roadster]

Hello Paul, these pics are from my 94....there are metal "O" rings that go over each port on the hose assembly....in one pic you will see the "O" ring on the port and in the other pic the "O" ring is stuck to the original compressor..... they both go over the openings on the hose assembly....that way they are lined up correctly during installation....
The other pics are of the "O" ring kit I purchased to replace them and others if and as needed.....have fun....and there are no grooves.....each side has a flush finish....the "O" rings just sit between the two mating surfaces.....still have to finish mine....[emoji16]10035100361003710038

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[Subfixer]

Perfect pics! Thanks Tom.

Looks like I got another incorrectly built hose assembly.

Going to have to keep looking......

[Roadster]

Glad to help out Paul......if you purchased the hose assembly from the PartsPlace....it is the correct hose set.....with the accumulator hose on the leftside of the manifold and with the correct bend to go around the coolant pipe...again...I sent mine back because of the non-effort packing of the part in the box.....most of the vendors for whatever reason are sending out the LT1 hose assembly which has the accumulator hose on the right side of the assembly and the configuration of the metal pipes is also obviously wrong....but you already know that.....should get back to work on mine since the weather has been cooling down....:)

[Subfixer]

The parts place hose was incorrectly assembled. Although the hose positions were correct, and the hose ends had the correct metric threads, the compressor end was for an R12 compressor, 90-93.

Ordered another from e-Bay, priceline4, Brad's Corvettes.
Said to be NOS in original packaging. p/n 10219090.

Hoping for the best......

[Subfixer]

Another hose assembly built incorrectly from Brad's Corvettes.
This time, the coupling nut that attaches to the condenser was American thread, like 90-93, vs Metric for 94-95..... Ugh...…..

Anyone know the o-ring part number for the R12 compressor to compressor hose assembly? I'm going to swap the adaptors on the compressor and use one of the other wrongly built hose assemblies. At least those have the correct coupling nuts.
The R12 compressor has o-ring grooves in the adaptor and will not accept the captured O-rings within the aluminum washers.

[Subfixer]

Got the o-ring part number from Mark H.

Talking with him, we have come to the conclusion that all these "NOS" hose assemblies are probably items that GM parts departments rejected. Now the bad parts are out there and the vendors selling them don't know they are wrong.
I get the impression that these same vendors are restocking returned parts, even when informed they are wrong.



What a 3 month nightmare trying to get ready for Carlisle!

As always, buyer beware.

[Subfixer]

Quick note to update this thread...

Now have cold R134a AC.

Ended up swapping the plate on top of the R134a Compressor with the one from my old R12 Compressor.
Used the compressor hose assembly that had correct metric coupling nuts for the accumulator and condenser ends, and the incorrect R12 fitting on the compressor end.

All other parts were correct 94-95 R134a AC stuff.

Parts replaced (all 94-95 ZR-1):
Condenser
Evaporator
Compressor
Accumulator/Dryer
All 3 hose assemblies
All 3 switches.
Orifice/filter

Good Parts left over (90-93 ZR-1 R12 system)

Evaporator
All 3 hose assemblies
All 3 switches (not sure if they all work)
R12 Compressor is rebuildable (I think this is where my leak was, needs correct adaptor plate).

If anyone needs any of the above, hit me up.

[tiegsd]

Need a condenser for mine, might want to take it off your hands if it's in decent shape.

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[tiegsd]

Would be for a '90, so not sure if it'll fit.

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[Subfixer]

Would be for a '90, so not sure if it'll fit.

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I'm not sure either, but you could stop by and see how it compares.


PM me for the address.

[tiegsd]

Many thanks for hooking me up with a condenser to replace my busted one. A step closer to working A.C. Thanks also for oil change help (sorry about the "fountain" of oil though)!

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[Subfixer]

Many thanks for hooking me up with a condenser to replace my busted one. A step closer to working A.C. Thanks also for oil change help (sorry about the "fountain" of oil though)!



No problem, already cleaned up.
The Northeast guys should start our own mini mechanical group like the WAZOO guys.
My garage is always open.

[dredgeguy]

Question for you AC experts. Have a 92 but previous owner converted to R134. I think the AC compressor cycle switch is getting wacky and purchased a replacement to use with R134. Problem is it has metric threads and my car still has SAE. So far, all R134 switches have metric threads and R12 have the SAE threads which is what I need.
Am I looking for trouble using a R12 switch when my system is R134? I realize the pressures are set differently but looking for a solution.

[-=Jeff=-]

I thought the switches were adjustable

[Mystic ZR-1]

[QUOTE=
....My garage is always open.[/QUOTE]
Great!!!
Leave the keys in the R8....
😀

[Subfixer]

Question for you AC experts. Have a 92 but previous owner converted to R134. I think the AC compressor cycle switch is getting wacky and purchased a replacement to use with R134. Problem is it has metric threads and my car still has SAE. So far, all R134 switches have metric threads and R12 have the SAE threads which is what I need.
Am I looking for trouble using a R12 switch when my system is R134? I realize the pressures are set differently but looking for a solution.
From everything I've read, and discussions with Mark H, R134a will work fine with the R12 components.
You are correct that all 94-95 R134a components are metric thread, including switches. 90-93 R12 fittings are all SAE (American) thread.

[lfalzarano]

You may have bought the wrong one. Keep everything SAE.


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[dredgeguy]

You may have bought the wrong one. Keep everything SAE.


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That means I have to get the R12 switch but my system is now R134. Just was concerned that operating the R12 switch with a R134 system could cause problems but guess not.

[jss06c6]

Quick note to update this thread...

Now have cold R134a AC.

Ended up swapping the plate on top of the R134a Compressor with the one from my old R12 Compressor.
Used the compressor hose assembly that had correct metric coupling nuts for the accumulator and condenser ends, and the incorrect R12 fitting on the compressor end.

All other parts were correct 94-95 R134a AC stuff.

Parts replaced (all 94-95 ZR-1):
Condenser
Evaporator
Compressor
Accumulator/Dryer
All 3 hose assemblies
All 3 switches.
Orifice/filter

Good Parts left over (90-93 ZR-1 R12 system)

Evaporator
All 3 hose assemblies
All 3 switches (not sure if they all work)
R12 Compressor is rebuildable (I think this is where my leak was, needs correct adaptor plate).

If anyone needs any of the above, hit me up.Paul,

Sorry I'm late to the dialog.. I too simply swapped my manifold from my old R-12 compressor to the R134 compressor. Simple swap..

Glad you got it going!

Steve

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[dredgeguy]

Marc said no problem using a R12 compressor cycle switch on a converted 134 system so will do that.

[jss06c6]

Marc said no problem using a R12 compressor cycle switch on a converted 134 system so will do that.Correct, I'm running my R12 switches on mine which is converted to R134. Works perfectly..

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[lfalzarano]

Same here!


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[Ccmano]

Reviving this old thread from last year. I just replaced my condenser and accumulator/dryer. In trying to disconnect the dryer from the Compressor hose I discovered that flange nut from the hose to the dryer had welded itself to the dryer (dissimilar metals) and was impossible to remove. After removing the compressor hose with the dryer attached I managed to get the nut off but found that the threads of the flange nut were so badly galled that the compressor hose could not be reused. My local hose shop couldn't rebuild it either.

In shopping for a replacement compressor hose I discovered that they are not in abundant supply. There are really two places that sell them. "The Parts Place" and "Volunteer Vettes". The 90-92' and 93-95' compressor hoses are not interchangeable. They are pricey as well. $150-180 plus shipping. I got mine from Volunteer and had it in hand in a few days. So if your stocking up on parts you may want to add this one to your list.
H
:cheers: