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940 ac

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Old Jul 7th, 2020, 01:17   #11
volvo always
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Was it a hot day when you had it regassed James?

If so, the gas they put in might not have been enough, if it vacc'ed down ok and held pressure, chances are it's not leaking but they didn't put enough gas in for it to stay working on colder days, particularly if you've got a sensitive low pressure switch.

All to do with Boyles Law and expansion of gases.
I was thinking possibly not filled enough, but it was a cloudy, cool day! Around 16 degrees. Strange how 2 years ago condenser clamp leak was far worse than now and AC lasted 5 months. Must of got worse since. No obvious leaks apart from condenser clamp a bit moist. Who knows on hidden parts.

James.
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Old Jul 7th, 2020, 09:56   #12
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I was thinking possibly not filled enough, but it was a cloudy, cool day! Around 16 degrees. Strange how 2 years ago condenser clamp leak was far worse than now and AC lasted 5 months. Must of got worse since. No obvious leaks apart from condenser clamp a bit moist. Who knows on hidden parts.

James.
It's possible that the internals seals have dried out somewhat due to being empty, how long did you run the AC for after having it filled?

Also a bit concerned about their comment on the quantity of gas that it takes. I've just looked it up here :

https://www.hella.com/techworld/uk/T...antities-2114/

Brand

Construction year

Type of coolant

Refrigerant quantity

OE Type of compressor

Type of compressor

Filling quantity
Volvo
900-Series 4-Zylindermotor - Sanden compressor
1993 - 1998
R134a
950
1161425-2
PAO 68 / PAG ISO 100
240

Sadly the headings etc didn't tabulate over when i copy&pasted but the figure you're looking at is 950 - the refrigerant quantity. That is a fairly average fill quantity of gas, go through all the other cars listed on there and you'll see what i mean.
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Old Jul 7th, 2020, 10:18   #13
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Most of the Bentleys and Rollers I regassed took between 6-850 grams, it is a big system and the price of R134a has shot up as they are now trying to introduce a new gas, (I can't remember what it is called though) so I'm not surprised they charged that much to regass it.

I would remove the clamp and see what the O-rings are like. If when you remove the pipes they don't sit proud of the recess they sit in then you need some thicker ones to seal it properly, also when you installed them did you rub any air con fluid on them? If not then they could have torn when fitting as the fluid acts as a lubricant.
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Old Jul 7th, 2020, 10:50   #14
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Most of the Bentleys and Rollers I regassed took between 6-850 grams, it is a big system and the price of R134a has shot up as they are now trying to introduce a new gas, (I can't remember what it is called though) so I'm not surprised they charged that much to regass it.

I would remove the clamp and see what the O-rings are like. If when you remove the pipes they don't sit proud of the recess they sit in then you need some thicker ones to seal it properly, also when you installed them did you rub any air con fluid on them? If not then they could have torn when fitting as the fluid acts as a lubricant.
Thanks all.

The pipes did seem to be level with the condenser on insertion and do not sit proud to allow the clamp to compress them much. I got the new seals from Volvo, but think like you they may be a bit small. There may be slight differences as the condenser is non genuine.

Also I should of swapped over and fitted my used pipes to ensure the angle going in was as original as possible. Yes I did rub the fluid over them.

At some point I may fit my new used pipes as had to cut the old ones to remove the old condenser so that I could get the old clamp off. I have installed a good clamp, but the old pipes re-joined with compression fittings..

James.
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Old Jul 7th, 2020, 11:18   #15
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It's possible those old pipes have gone porous where you cut them James so even with compression fittings, they could be leaking round the olives. Only way of getting rid of the leaks is to have the gas that's in it recovered (that will also tell you how much you've lost), vac it down for at least half hour (preferably an hour) then refill the gas with the right amount of compressor oil, leak detector dye (usually a small charge for the dye) and leak sealer (again, usually a small charge) and errrrrr - oh yeah - 950g of R134a gas!

The new gas is R1234a "Solstice" gas and is about twice the price of the old R134a so they're trying to "price condition" people by jacking up the price of the R134a but what they can't condition people for is the fact the Solstice gas loses its effectiveness and tends to leak out after 2 years.

In other words, the sooner you do it, the cheaper it's going to be.
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Old Jul 7th, 2020, 12:31   #16
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It's possible those old pipes have gone porous where you cut them James so even with compression fittings, they could be leaking round the olives. Only way of getting rid of the leaks is to have the gas that's in it recovered (that will also tell you how much you've lost), vac it down for at least half hour (preferably an hour) then refill the gas with the right amount of compressor oil, leak detector dye (usually a small charge for the dye) and leak sealer (again, usually a small charge) and errrrrr - oh yeah - 950g of R134a gas!

The new gas is R1234a "Solstice" gas and is about twice the price of the old R134a so they're trying to "price condition" people by jacking up the price of the R134a but what they can't condition people for is the fact the Solstice gas loses its effectiveness and tends to leak out after 2 years.

In other words, the sooner you do it, the cheaper it's going to be.
I'm going to get an oil and filter change and gearbox drain and refill at a garage I use in Birmingham on Thursday, so while there I'll get them to evacuate the AC and see how much its lost!

I'll also ask them how much they would charge to re-gas one changed pipes, and O rings to a larger size.

It definately needs a leak sealer, a good idea!
Probably wont do it for a month as may be working on a bungalow for an old client.

Not good news on the gas! Especially if prone to leak!

James
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Old Jul 9th, 2020, 22:46   #17
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The Garage did my oil and filter change and auto gearbox drain and refill with my supplied parts.

The chap connected the AC machine to the AC port and switched the machine on and there was nothing to extract. Machine said empty! Tried it twice!
So a massive leak or leaks!

Probably not worth trying again as suspect really needs new evaporator, compressor/ rebuilt and all seals replacing. Probably £400 to spend!
In the past had hissing from under the dash when switched AC off and sometimes a wiff of the refrigerant. Think evaporator could be the big leak.

Certainly felt more smooth with the new 10w 40 semi synthetic oil and the gearbox oil.

James

Last edited by volvo always; Jul 9th, 2020 at 22:50.
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Old Jul 9th, 2020, 23:20   #18
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The Garage did my oil and filter change and auto gearbox drain and refill with my supplied parts.

The chap connected the AC machine to the AC port and switched the machine on and there was nothing to extract. Machine said empty! Tried it twice!
So a massive leak or leaks!

Probably not worth trying again as suspect really needs new evaporator, compressor/ rebuilt and all seals replacing. Probably £400 to spend!
In the past had hissing from under the dash when switched AC off and sometimes a wiff of the refrigerant. Think evaporator could be the big leak.

Certainly felt more smooth with the new 10w 40 semi synthetic oil and the gearbox oil.

James
The hissing under the dash is just the vacuum system working, also the gas expands when it enters the evaporator and is then sucked out into the compressor which creats a partial vacuum inside the system - there's a his as this equalises when the A/C is turned off.

Chances are, purely on a likelihood of being damaged through use, the condensor is the leaky bit, not too expensive on a 2/7/9xx or any of the umpteen other cars that uses the same one! Usually about £60-80 depending on supplier but that was the price last time i checked - may have altered since!

Given the previous lot said the system was intact and charged you £Arms & legs to fill it, i think you have some sort of redress on them.

By the way, FYI the refrigerant has no odour but reacts with a lit cigarette to produce cyanide gas as you inhale. If you smoke and you're still here to tell the system is empty, it's a reasonable bet the leak isn't inside the cabin!
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Old Jul 9th, 2020, 23:47   #19
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Originally Posted by Laird Scooby View Post
The hissing under the dash is just the vacuum system working, also the gas expands when it enters the evaporator and is then sucked out into the compressor which creats a partial vacuum inside the system - there's a his as this equalises when the A/C is turned off.

Chances are, purely on a likelihood of being damaged through use, the condensor is the leaky bit, not too expensive on a 2/7/9xx or any of the umpteen other cars that uses the same one! Usually about £60-80 depending on supplier but that was the price last time i checked - may have altered since!

Given the previous lot said the system was intact and charged you £Arms & legs to fill it, i think you have some sort of redress on them.

By the way, FYI the refrigerant has no odour but reacts with a lit cigarette to produce cyanide gas as you inhale. If you smoke and you're still here to tell the system is empty, it's a reasonable bet the leak isn't inside the cabin!
Interesting stuff. Explains the hissing. I'm a non smoker. The condenser in front of rad I replaced 4 years ago with a new Nissens brand for £65, so should hope its still ok. Looks to be no damage of stones through the grille. I only do around 3k a year in it.

I suspect they would say that the refrigerant all leaked out at the condenser clamp, as it was dripping a little bit! Probably say it passed fine on test but seal must of blown after. I certainly can't prove anything and put it down to experience. Think in future, deal purely with an AC specialist if I do try to get it working! May fit the better AC pipes, bigger seals and get Cool car out to test and use sniffer to look for leaks, before refilling with sealer and dye additive.

James.

Last edited by volvo always; Jul 9th, 2020 at 23:52.
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Old Jul 9th, 2020, 23:53   #20
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Interesting stuff. Explains the hissing. I'm a non smoker. The condenser in front of rad I replaced 4 years ago with a new Nissens brand for £65, so should hope its still ok. Looks to be no damage of stones through the grille. I only do around 3k a year in it.

I suspect they would say that the refrigerant all leaked out at the condenser clamp, as it was dripping a little bit! Probably say it passed fine on test but seal must of blown after. I certainly can't prove anything and put it down to experience. Think in future, deal purely with an AC specialist if I do try to get it working! May fit the better AC pipes, bigger seals and get Cool car out to test and use sniffer to look for leaks, before refilling with sealer and dye additive.

James.
Sounds like a good plan James! Might pay to invest in a diagnostic session with them to find where the leak is, rather than paying for umpteen different parts you may or may not need though.
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