An inquiry about A/C compressors failure

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lolo55
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An inquiry about A/C compressors failure

Postby lolo55 » Sat May 23, 2020 2:25 pm

I have a question. When A/C compressor fails, it often spreads dangerous metal particles through the system and this leads to a more expensive repair bill. I wonder if installing a filter right after the compressor to catch these solid particles would be a good idea. Making it possible to only replace the failed compressor without the need for replacing other compnents in the system. And does A/C circuits that use drier receiver are more reliable, since a drier receiver will catch solid contaminatns and prevent them from reaching and damaging the compressor.
grumpy old man
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Re: An inquiry about A/C compressors failure

Postby grumpy old man » Sat May 30, 2020 3:40 pm

It has been common practice for years in residential and commercial installations to install a filter just outside the compressor assembly on the high pressure line. I can only guess that the reason it never caught on in automotive is that there is no gain.
lolo55
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Re: An inquiry about A/C compressors failure

Postby lolo55 » Sat May 30, 2020 4:31 pm

grumpy old man wrote:It has been common practice for years in residential and commercial installations to install a filter just outside the compressor assembly on the high pressure line. I can only guess that the reason it never caught on in automotive is that there is no gain.



How there is no gain?. Auto A/C repairs are very costly only because when a compressor fails in a castrophic way it send metallic debris through the sytem. A filter will catch such contmaints and enable us to only replace the failed compressor rather than all A/C components.
B52bombardier1
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Re: An inquiry about A/C compressors failure

Postby B52bombardier1 » Sat May 30, 2020 5:41 pm

Its all about the dollars. The manufacturer and the dealerships want you to return and pay for a more expensive repair. Planned obsolescence.

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Al9
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Re: An inquiry about A/C compressors failure

Postby Al9 » Sun May 31, 2020 3:14 am

Maybe a non removable filter means having to either cut a line open or replace it, and a removable one means two more potential leak points...
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Re: An inquiry about A/C compressors failure

Postby Tim » Sun May 31, 2020 8:44 am

Automotive A/C systems should not be compared to an HVAC system.

Filters will plug if enough debris is present. They make thimble system mess guards as well as this inline filter. Personally would never use either. But they sell them for people thinking it will somehow save their compressor. They also make refrigerant in a can with a charging hose. Not the best way to charge a system. But people are making money by selling them.

https://www.ackits.com/in-line-filter-kit-38-516-12-dia-tubes-25547?search=in-line%20filter
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lolo55
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Re: An inquiry about A/C compressors failure

Postby lolo55 » Thu Jun 04, 2020 2:28 am

Tim wrote:Automotive A/C systems should not be compared to an HVAC system. Filters will plug if enough debris is present.


And this is a good thing indeed. If the filter catches recirculating debris and becomes clogged then pressue switch should prevent running the compressor and the system is saved from bad operating conditions resulting from recirculating debris getting into the compressor and from blockage in circuit.
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Re: An inquiry about A/C compressors failure

Postby Al9 » Thu Jun 04, 2020 3:24 am

AC doesn't work that way, unfortunately.

It's a matter of logic. Whenever the suction side of a gas pump goes vacuum due to a blockage somewhere in the fluid circuit - not so much left to pump anymore.

How is clutch cycling prevented in bus/coach AC compressors? Unloaders. Valves that close the suction flow to a certain bank of cylinders. When this happens, suction pressure goes up, discharge pressure goes down. Like with a car's variable displacement comp. Just in steps.
Last edited by Al9 on Thu Jun 04, 2020 8:58 am, edited 2 times in total.
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Tim
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Re: An inquiry about A/C compressors failure

Postby Tim » Thu Jun 04, 2020 7:20 am

lolo55 wrote:
Tim wrote:Automotive A/C systems should not be compared to an HVAC system. Filters will plug if enough debris is present.


And this is a good thing indeed. If the filter catches recirculating debris and becomes clogged then pressue switch should prevent running the compressor and the system is saved from bad operating conditions resulting from recirculating debris getting into the compressor and from blockage in circuit.


The reduction of oil flow happens as the filter becomes clogged. Placing additional stress on a failing compressor.
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Re: An inquiry about A/C compressors failure

Postby bohica2xo » Thu Jun 04, 2020 8:48 am

The only way for this to be effective is for the filter to be large enough to do the job, and be installed on a new system.

As I said in the other thread you have open, a filter from a 15 ton HVAC system will work. It is about the same size as the compressor and would require a new discharge line - and finding enough space in a modern engine compartment for an item that large.

Just not practical for a manufacturer to install a device like this in the average car. Adding even a single dollar to the manufacturing cost of an automobile has a huge economic effect. Adding at least 3 new under hood parts would be hard to absorb on a $40k USD car - it would show up on the sticker price.

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