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Discussion Starter · #1 ·
I had some problems with my AC system a few months ago with an occasionaly "whoosh" from under the bonnet releasing gas. Anyway I traced this to the broken fan relay wire from the pressure switch and the fan now starts when pressure is reached.
I decided last week to visit the local air-con specialist and get the system re-gassed. He said that R12 was not available anymore and a conversion to R134a was needed. He filled the system with R134 and a special oil which is apparently new. Anyway it was cool but not cold (about 15C from the vents, should be 11-12) but worked fine until today when no air con at all.
The compressor runs but the pipes to and from the condenser don't get hot or cold. Has anyone had any problems with this conversion oil in a Saab before or has something just not been tightened properly when the system was re-gassed?

Any ideas? The temp gauge on the car read 37 here in Bournemouth today and it is a little too warm to be driving round without the AC!

Cheers,

Duncan
 

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If this is your car 'CS Carlsson 1992' then I would have said that it was already R134a.

I thought all CS's were R134a from day one.

I know '91's were R12 and '93's R134a.

I'd be concerned if the compressor is running but the pipes not getting hot/cold, as there is a low pressure switch cut out. Maybe your've not quite dropped to that point.

So it seems the woosh is bad and venting gas via the safety valve before, and it now seems that you have a leak somewhere.

Do you know if the installed a UV dye to the gas? if so you can look for the leak area.

Andrew
 

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Discussion Starter · #3 ·
There was no R134 sticker anywhere under the bonnet so we assumed that it wasn't. The blokes book said that all from 93 on would be R134 and being a summer 92 it wasn't fitted.

The larger pipe is not getting cold but the smaller one is not getting too hot, apart from where it comes in and out of the condenser.

The pressure switch has full connectivity to the ACC and the relay as I spent quite a few hours stripping the loom out of the front of the car and repairing all the broken cables. I just wonder if there is a pressure switch problem too.

I will return to him today and ask about the UV dye business.

One concern I had was that I had thought I'd read somewhere that a system designed for R12 and then filled with R134 would eat through the seals on the compressor. I am a bit concerned that this new "conversion oil" has done something like that.
 

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Discussion Starter · #4 ·
I have depressingly found the problem to be the top hose from compressor to condenser has blown open on one of the joints. Saab want £217 + VAT for it and from reading other articles I probably need a new condenser too as the fittings tend to strip the aluminium thread on the condenser as they are removed.
Anyone breaking a 92 CS with air con?
 

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If it's just the hose and you can get it off without damage, I'm sure that you will be able to take it to a hydraulic hose repair shop (yellow pages etc) and they will put a new hose on the existing fittings. They do this all day every day for JCB drivers with split hoses and it's relatively cheap.
 
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