1987/1993/1996 Bronco AC upgrade...

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Al9
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Re: 1987/1993/1996 Bronco AC upgrade...

Postby Al9 » Fri Apr 10, 2020 3:01 pm

About the lines, mufflers without any doubt. Remove them and you may get something similar to the "Sanden rumble". Still nothing compared to the array of noises (low pitched groans to high pitched moans) i have to put up with, my compressor can be described as an opera singer.

Wonder why they put them on both sides in your vehicle. Usually it's either low side only (variable displacement compressors) or high side only (fixed displacement compressors). A muffler offers some resistance to flow and turns a flush into a hard and expensive task. Systems equipped with rotary (scroll and vane) pumps seldom come with them for some reason.
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bohica2xo
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Re: 1987/1993/1996 Bronco AC upgrade...

Postby bohica2xo » Fri Apr 10, 2020 3:56 pm

Enough with the noise stuff.

Mufflers are a trash trap on a system with a failed compressor. We re-plumb & toss them all the time. On vintage restorations I bore out the tubes in the can, add a straight through tube and braze the can on as a decoration. Plenty of Mopars that way now.

Besides, that Bronco makes enough of a rumble to cover up a failed idler bearing anyway.

I think we could make better cars if we fired half of the NVH staff, and beat some sense in to the other half. I think the guy that invented the liquid filled engine mount should be burned at the stake.

Ok, back to A/C. The seal in that fitting was probably an O ring. I will have to go look and see if I have an unused one to look at and be sure.

If you have a new hose that fits, and has cans in it, no problem. If you are rebuilding hoses, delete them.
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slawson2000
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Re: 1987/1993/1996 Bronco AC upgrade...

Postby slawson2000 » Fri Apr 10, 2020 4:55 pm

Well, I needed a new line to go with the new style compressor. I guess run it for now. If anything happens I will rebuild without them or just replace it. I think it was only about $60. Interesting info on the mufflers. Odd concept.

Please let me know about that seal. I think it is an o'ring. but it may be something else seeing as it sits on that port. Also, I take out the stem of the new hose, correct?
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slawson2000
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Re: 1987/1993/1996 Bronco AC upgrade...

Postby slawson2000 » Tue Apr 14, 2020 5:30 pm

B, any luck on what that seal should be?
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bohica2xo
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Re: 1987/1993/1996 Bronco AC upgrade...

Postby bohica2xo » Tue Apr 14, 2020 6:12 pm

Sorry, took me a while to locate my stash of those fittings.

I picked it out of the fitting, and it is a square O ring. All hose may have it. McMaster DOES have it, but only in packs of 100

https://www.mcmaster.com/4061t113

B
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slawson2000
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Re: 1987/1993/1996 Bronco AC upgrade...

Postby slawson2000 » Thu May 07, 2020 4:53 pm

Not having a lot of luck sourcing an oring, it seems thay come in packs that caost about as much as a new switch.
So, if I have to buy a new switch, I would be interested in moving the cut-out switch to the back of the compressor on the high pressure line if possible.
The valve is F1CZ19D644A or Motorcraft YF49. Not sure the thread. Maybe there is such a thing as a 90deg, a Tee, or an extension to fit both the valve and the switch?
This location would be better for the wiring.
Any thoughts?
Thanks
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bohica2xo
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Re: 1987/1993/1996 Bronco AC upgrade...

Postby bohica2xo » Thu May 07, 2020 6:20 pm

The HPRV in your picture may have the same thread as your HPCO switch.

If so, you can swap out the HPCO switch for the HPRV. As I recall you were running a welded up HPRV on your old system without an issue.

.
ice-n-tropics
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Re: 1987/1993/1996 Bronco AC upgrade...

Postby ice-n-tropics » Fri May 08, 2020 5:14 am

Al9 wrote:Highly likely they're mufflers. I have one on my car's suction line and it's supposed to keep the reed valve noise from reaching the evaporator. Fails miserably, in my case. Here's a pic.


SD7 had discharge reed noise due to oil stiction with flutter caused by BOURNELLI effect (lowering pressure at increasing velocity) as discharge valve opens. in later years Sanden used my patent for shot blasting the discharge valve to reduce the oil stiction and tendency to flutter as pressure pulsations increased the Bournelli effect.
With shot blasted discharge valve the discharge muffle could usually be eliminated but a small suction muffle may be helpful for suction valve noise using unforgiving plastic inner hose liner. !00% rubber R12 hose has better noise dampening.
Ford dealer installed AC was often pre charged using the brass fittings to only open when screwed together.
hotrodac
Al9
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Re: 1987/1993/1996 Bronco AC upgrade...

Postby Al9 » Fri May 08, 2020 10:57 am

Interesting. In variable comps like mine it's the other way around. Patent US6379121B1 (not involved with it in any way, just came across it) which likely refers to a Denso variable comp basically states that the suction reed valves don't open all the way and tend to vibrate when the swashplate is at or about at maximum angle. The noise easily transmits to the evap through the suction line when evap superheat is positive. Hence the different muffler location. Same noise, different reed valve generating it. Then if you're able to improve reed valve design like in both patents, so that you can just do away with mufflers and ease flush operations, it's even better.
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slawson2000
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Re: 1987/1993/1996 Bronco AC upgrade...

Postby slawson2000 » Fri May 08, 2020 1:03 pm

Ice, interesting info. Thanks.

B, As far as the HPRV, it was not welded. But it had blown and been replaces a couple times before the HPCO and electric fans were installed way back when.

I was running this HPCO on the HP service port.

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It took care of both the HPCO and the R134a HP service adapter. With the engine swap and the AC swap, the location of the HP service port is further away than it was and will require me to lengthen the wiring to its new location. That is why I am looking at putting it in this location. It looks for a better install.

Most HPCO's I have seen are pretty wide and probably would not fit. So I was thinking that the HPCO from a 95 Bronco
(6L3Z19D594A) or something similar, and an adapter like this although I have no idea of what the threads would be.

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Maybe you can make a better suggestion?

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